One document matched: draft-ietf-snmpconf-pm-03.txt
Differences from draft-ietf-snmpconf-pm-02.txt
Internet Draft Policy-Based Management MIB October 11, 2000
Policy Based Management MIB
draft-ietf-snmpconf-pm-03.txt
October 11, 2000
Steve Waldbusser
Jon Saperia
Thippanna Hongal
Status of this Memo
This document is an Internet-Draft and is in full conformance
with all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet
Engineering Task Force (IETF), its areas, and its working
groups. Note that other groups may also distribute working
documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other
documents at any time. It is inappropriate to use Internet-
Drafts as reference material or to cite them other than as
"work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed
at http://www.ietf.org/shadow.html.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
1. Abstract
This memo defines a portion of the Management Information Base
(MIB) for use with network management protocols in TCP/IP-
based internets. In particular, this MIB defines objects that
enable policy-based configuration management of SNMP
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infrastructures.
2. The SNMP Management Framework
The SNMP Management Framework presently consists of five
major components:
o An overall architecture, described in RFC 2571 [1].
o Mechanisms for describing and naming objects and
events for the purpose of management. The first
version of this Structure of Management Information
(SMI) is called SMIv1 and described in STD 16, RFC
1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The
second version, called SMIv2, is described in STD 58,
RFC 2578 [5], RFC 2579 [6] and RFC 2580 [7].
o Message protocols for transferring management
information. The first version of the SNMP message
protocol is called SNMPv1 and described in STD 15, RFC
1157 [8]. A second version of the SNMP message
protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901
[9] and RFC 1906 [10]. The third version of the
message protocol is called SNMPv3 and described in RFC
1906 [10], RFC 2572 [11] and RFC 2574 [12].
o Protocol operations for accessing management
information. The first set of protocol operations and
associated PDU formats is described in STD 15, RFC
1157 [8]. A second set of protocol operations and
associated PDU formats is described in RFC 1905 [13].
o A set of fundamental applications described in RFC
2573 [14] and the view-based access control mechanism
described in RFC 2575 [15].
A more detailed introduction to the current SNMP Management
Framework can be found in RFC 2570 [18].
Managed objects are accessed via a virtual information
store, termed the Management Information Base or MIB.
Objects in the MIB are defined using the mechanisms defined
in the SMI.
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This memo specifies a MIB module that is compliant to the
SMIv2. A MIB conforming to the SMIv1 can be produced
through the appropriate translations. The resulting
translated MIB must be semantically equivalent, except
where objects or events are omitted because no translation
is possible (use of Counter64). Some machine readable
information in SMIv2 will be converted into textual
descriptions in SMIv1 during the translation process.
However, this loss of machine readable information is not
considered to change the semantics of the MIB.
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3. Overview
Large IT organizations have developed management strategies to cope
with the extraordinarily large scale inherent in large networks. In
particular, they try to configure the network as a whole by describing
and implementing high-level business policies, rather than managing
device by device, where orders of magnitude more decisions (and
mistakes) may be made.
Following this management practice results in the following benefits:
- Reduced training needs (fewer details to learn)
- Reduced documentation costs (fewer details to document)
- Reduced impact of turnover (less ad-hoc knowledge goes out the door)
- Greater testability (a greater percentage of fielded
configurations may be tested in the lab)
- Higher reliability (combination of factors above)
- Lower cost of changes (changes can be simpler and operate over a
wider extent)
- Lower cost of corporate mergers (less knowledge to transfer; fewer
policies to integrate)
- Lower cost of ownership (combination of factors above)
To illustrate the concept of "business policies", some examples are:
- All routers will run code version 6.2
- On-site contracters will all have special security restrictions on
their ports
- All voice over cable ports in California must provide free local
calling
- Apply special forwarding to all ports whose customers have paid
for premium service.
Each of these policies could represent an action applied to hundreds
of thousands of configuration variables.
In order to automate this practice, customers need software tools that
will implement business policies across their network, as well as
a standard protocol that will ensure that it can be applied to all of
their devices, regardless of the vendor.
This practice is called Policy-Based Network Management. This document
defines standard managed objects for the Simple Network Management
Protocol that are used to distribute policies in a standard form
throughout the network.
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4. Policy-Based Management Architecture
Policy-based network management is the practice of applying management
operations globally on all managed objects that share certain
attributes.
Policies always express a notion of:
if (an object has certain characteristics) then (apply operation to
that object)
Policies take the following normal form:
if (policyFilter) then (policyAction)
A policyFilter is an expression which results in a boolean
to determine whether or not an object is a member of a set of
objects upon which an action is to be performed.
A policyAction is an operation performed on a set of objects.
These policies are executed on or near managed devices, where the
objects live (and thus their characteristics may be easily inspected),
and where operations on those objects will be performed.
A management station is responsible for distributing an organization's
policies to all of the managed devices in the infrastructure. The
pmPolicyTable provides managed objects for sending a policy to a
managed device.
In this architecture, the objects that policies act on are called
elements. An element is a group of related MIB variables such as all
the variables for interface #7. This enables policies to be expressed
more efficiently and concisely. Elements can also model circuits,
CPUs, queues, processes, systems, etc.
The execution model for policies on a managed device is:
foreach element for which policyFilter returns true
execute policyAction on that element
For example:
If (interface is fast ethernet) then (apply full-duplex mode)
If (interface is access) then (apply security filters)
If (gold service paid for on circuit) then (apply special queueing)
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PolicyFilters have the capability of performing comparison operations
on SNMP variables, logical expressions, and other functions. Many
device characteristics are already defined in MIBs and are
easy to include in policyFilter expressions (ifType == ethernet,
frCircuitCommittedBurst < 128K, etc). However, there are
important characteristics that aren't currently in MIB objects, and
worse, it is not current practice to store this information on managed
devices. Therefore, this document defines MIB objects for this
information. To meet today's needs there are three missing areas:
roles, capabilities and time.
Roles
A role is an administratively specified characteristic of a managed
element (for example, an interface). It is a selector for
policy rules, to determine the applicability of the rule to
a particular managed element.
Some examples of roles are political, financial, legal,
geographical, or architectural characteristic, typically not directly
derivable from information stored on the managed system. For example,
"paid for premium service" or "is plugged into a UPS" are examples of
roles, whereas the percent utilization of a link would not be.
The types of information one would put into a role are:
political - describes the role of a person or group of people, or of
a service that a group of people use. Examples:
executive, sales, outside-contracter, customer.
If (attached user is executive) then (apply higher bandwidth)
If (attached user is outside-contracter) then (restrict access)
financial/legal - describes what financial consideration was
received. Could also include contractual or legal
considerations. Examples:
paid, gold, free, trial, demo, lifeline
(The lifeline example is supposed to model the
RBOC's legal obligation to provide dial tone to
elderly/poor).
If (gold service paid for) then (apply special queueing)
geographical - describes the location of an element. Examples:
California, Headquarters, insecure conduit.
If (interface leaves the building) then (apply special security)
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architectural - describes the network architects "intent" for an
element. For example: backup, trunk.
If (interface is backup) then (set ifAdminStatus = down)
Collectively, these 4 classes of characteristics are called
roles. Roles are human defined strings that can be referenced by
a policyFilter. Multiple roles may be assigned to each element.
Capabilities
Some actions are inappropriate for certain elements or are simply
unsupported. PolicyFilter's must be able to be defined so that a
policy can be applied only to elements that have the proper
capability. The capabilities table provides MIB objects that
describe the capabilities of the system.
Time
Managers may wish to define policies that are true for certain
periods of time. This might mean that a policy is downloaded and is
dormant for a period of time, becomes active, and then later becomes
inactive. Sometimes these time periods will be regular (M-F 9-5) and
sometimes ad-hoc. This MIB provides MIB objects that allow
policies to be dependent on time.
5. Policy Based Management Execution Environment
There are several steps performed in order to execute policies
in this environment:
- Element Discovery
- Element Filtering
- Policy Enforcement
5.1. Element Discovery
An element is a uniquely addressable entity on a managed
device. Examples of elements include interfaces, circuits,
queues, CPUs, and processes. Sometimes various attributes of
an entity will be described through tables in several standard
and proprietary MIBs - as long as the indexing is consistent
between these tables, the entity can be modeled as 1 element.
For example, the ifTable and the dot3Stats table both contain
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attributes of interfaces and share the same index (ifIndex),
therefore they can be modeled as one element type.
The Element Type Registration table is used for the manager to
learn what element types are being managed by the system and
to register new types if necessary. An element type is
registered by providing the OID of an SNMP object (i.e.,
without the instance). Each SNMP instance that exists under
that object is a distinct element. The address of the element
is the index part of the discovered OID. This address will be
supplied to policy filters and actions so that these
expressions can inspect and configure the element.
For each element that is discovered, the policy filter is
called with the element address as an argument to see if the
element is a member of the set that the policy acts upon.
5.1.1. Implementation Notes
Note that while the external behavior of this registration
process is defined in terms of the walking of MIB tables,
implementation strategies may differ. For example, commonly-
used element types (like interface) may have purpose-built
element discovery capability built-in and advertised to
managers through an entry in the pmElementTypeRegTable.
Before registering an element type, it is the responsibility
of a manager to inspect the table and see if it is already
registered (by the agent or another manager). Note that
entries that differ only in the last OID (which specifies
which object in an entry) are effectively duplicates and
should be treated as such by the manager.
The system which implements the Policy-Based Management MIB
may not have knowledge of the format of object identifiers in
other MIBs. Therefore it is inappropriate for it to check
these OIDs for errors. It is the responsibility of the
management station to register well-formed object-identifiers.
For example, if an extra sub-identifier is supplied when
registering the ifTable, no elements will be discovered.
Similarly, if a sub-identifier is missing, every element will
be discovered numerous times (once per column) and none of the
element addresses will be well-formed.
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5.2. Element Filtering
The first step in executing a policy is to see which elements
match the policy filter. To evaluate a policy, the policy
filter is called once for each element and runs to completion.
The element address is the only state that is passed to the
expression for each invocation (in particular, no state is
remembered from the previous invocation of this element nor
from the previous invocation of the policy filter). If any
syntax or processing error occurs, the expression will
terminate immediately for this element. If the expression
returns non-zero, the corresponding policy action will be
executed for this element.
5.2.1. Implementation Notes
It is an implementation-dependent matter as to how policy
filters are scheduled. Each filter/element combination is
conceptually its own process and can be scheduled sequentially
or one or more could be run simultaneously.
Policy filters have no side-effects. Policy filter
interpreters are encouraged to stop processing a filter as
soon as it's return value is known.
5.3. Policy Enforcement
For each element that has returned non-zero from the policy
filter, the corresponding policy action is called. The element
address is the only state that is passed to the expression for
each invocation (in particular, no state is remembered from
the policy filter evaluation, nor from the previous
filter/action invocation of this element nor from the previous
invocation of the policy filter or action). If any syntax or
processing error occurs, the expression will terminate
immediately for this element.
5.3.1. Implementation Notes
It is an implementation-dependent matter as to how policy
actions are scheduled. Each filter/element combination is
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conceptually its own process and can be scheduled sequentially
or one or more could be run simultaneously.
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6. Policy Based Management Expression Language
Policy filters and policy actions are expressed with the
policy expression language. This expression language provides
the power to make parenthesized logical and arithmetic
comparisons and to call a number of pre-defined functions.
The policy expression language is a subset of the C language.
Some examples of the features that have been removed are:
function definitions, pointers (except for constant pointers
used for strings), array, structures, floating point and pre-
processor functions.
This language is formally defined as a subset of ANSI C [19].
The policy expression language is defined in this standard by
reference to ANSI C, but only allows those constructs that may
be expressed in the BNF documented here. This is done because
while BNF doesn't fully specify syntactical rules (it allows
constructs that are invalid) and doesn't specify semantic
rules, it can successfully be used to define the subset of
ANSI C that is required for conformance to this standard.
The use of comments and newlines are allowed and encouraged
where they will promote readability of expressions.
6.1. Formal Definition
The policy expression language follows the syntax and
semantics of ANSI C [19], but expressions are limited to those
that can be expressed in the following EBNF form:
identifier : letter ( letter | digit )*
string : '"' char* '"'
block : ( declaration )* const_exp ( ';' const_exp )*
var_or_array : identifier ( '[' integer ']' )?
declaration : 'unsigned'? type var_or_array
( ',' var_or_array )* ';'
type : 'int' | 'short' | 'long' | 'char'
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const_exp : compound_exp | conditional_exp | assignment
| 'for' '(' const_exp? ';' const_exp? ';'
const_exp? ')'
( const_exp? | '{' block '}' )
| 'while' '(' const_exp? ')'
( const_exp? | '{' block '}' )
assignment : identifier '=' const_exp
conditional_exp : const_exp '?' const_exp ':' const_exp
binary_operator : '*' | '/' | '%' | '+' | '-' | '<<' | '>>'
| '<' | '>' | '<=' | '>=' | '==' | '!='
| '&' | '^' | '|' | '&&' | '||'
compound_exp : unary_exp (binary_operator unary_exp)*
unary_exp : integer | char_const | string | identifier
| functioncall
| '(' const_exp ')'
| unary_operator unary_exp
| '++' identifier | '--' identifier
| identifier '++' | identifier '--'
unary_operator : '+' | '-' | ' | '!'
functioncall : identifier '(' arg_exp_list? ')'
arg_exp_list : ( '&' )? const_exp ( ',' ( '&' )? const_exp )*
-- For reference
letter : Any lower or upper case letter or underscore
char : Any character
digit : '0' | '1' | '2' | '3' | '4' |
'5' | '6' | '7' | '8' | '9'
hexdigit : digit | 'A' | 'B' | 'C' | 'D' | 'E' | 'F' |
'a' | 'b' | 'c' | 'd' | 'e' | 'f'
decimal : digit+
integer : decimal | ( '0' 'x' hexdigit+ )
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char_const : ( ''' char ''' ) |
( ''' '' decimal ''' )
7. Accessor Functions
Accessor functions are built-in functions available primarily
to provide access to information on the local system or to
more efficiently manipulate this information. A group of
functions is organized into a library, the unit of conformance
for function implementation. In order to claim conformance to
a library, an implementation must implement all functions in a
library.
In order for a management station or a script to understand if
a certain library of functions is implemented, each library
will have a registration OID that it registers in this MIB's
capabilities table. Thus, conformance to a library can be
tested with the capMatch library function (in the base
library) or by inspecting the pmCapabilitiesType objects in
the pmCapabilitiesTable.
8. Base Accessor Function Library
A standard base library of accessor functions is available to
all systems that implement this specification. This library is
known by the capability OID of:
pmBaseFunctionLibrary ::= { policyMgt pmConformance pmGroups 2 }
This library contains three types of functions:
- SNMP Access functions
- Policy Configuration Access functions
- Utility functions
- Library Functions
8.1. SNMP Access Functions
Two sets of SNMP Access functions are available with different
situations in mind:
- Convenience SNMP Functions
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In an effort to keep simple things simple, these functions are
easy to use and promote easy to understand code. These functions
will suffice for the majority of situations where a single
variable is referenced and the desired error recovery is to simply
(and immediately) give up (and move to the next policy-element
combination). In more complex cases, the General SNMP Functions
can be used at the cost of several times the code complexity.
The convenience SNMP functions are getint, getvar, exists,
setint, setvar, setRowStatus, and searchcolumn.
- General SNMP Functions
The General SNMP functions allow nearly any legal SNMP Message to
be generated, including those with multiple varbinds, getNext
operations, notifications, and messages with explicit addressing
or security specifications.
The general SNMP functions are writeVarbind, readVarbind,
snmpsend, and trapsend.
Many of the accessor functions use a character string encoding
of a value that may be one of many SMI data types as input or
output parameters. The actual type is not encoded in the
value, but rather is specified elsewhere, possibly by nature
of the context in which it is used. The encodings are:
Any Integer value
(INTEGER, Integer32, Counter32, Counter64, Gauge32, Unsigned32,
TimeTicks, Counter64):
Ascii-encoded integer in ascii,
range: -2147483648 .. 18446744073709551615
Note that getint and setint encode integers as C integer values
and do not use this character string encoding.
Octet String
The character string contains the unencoded value of the octet
string.
When an accessor function is encoding this value it often won't
know if it is a null-terminated display string so it will
null-terminate the string AND return the length of the string,
allowing the expression to treat it as a null-terminated string
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only if appropriate. This is not an issue for utility accessor
functions like itoa, where the type is known.
[note: Is the above text understandable? I'm
open to suggestions as to wording. What we want to allow is:
if (!strcmp("eth0", getvar("ifDescr.1", ...)))
... -- we know it's a null terminated string
even though for other contexts we can't depend on null termination:
getvar("ifPhysAddr.1", physAddr, physAddrLen);
if (!memcmp(physAddr, " 08 00 89", 3))
...
Also remember that the policy agent doesn't have a MIB compiler so it
doesn't know if the OCTET STRING varbind is a DisplayString.
]
Object Identifier
A decimal ascii encoded object identifier stored in a
null-terminated string.
subid: decimal
oid: subid | subid '.' oid
Note that ascii descriptors (e.g. "ifIndex") are ever used in these
encodings "over the wire". They are never returned from accessor
functions nor are they ever accepted by them. NMS user
interfaces are encouraged to allow humans to view object
identifiers with ascii descriptors, but they must translate those
descriptors to dotted-decimal format before sending them in MIB
objects to policy agents.
8.1.1. Convenience SNMP Functions
8.1.1.1. getint()
The getint() function is used to retrieve the value of an SNMP
MIB instance when it is known to be of a 32 bit integer type.
int getint(char *oid)
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Oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
The agent will retrieve the instance in the same SNMP context
in which the element resides. Note that no actual SNMP PDU
needs to be generated and parsed when the policy MIB module
resides on the same system as the managed elements.
If the queried object identifier value does not exist or is
not an 32-bit integer-valued object, execution of the
containing expression on the current element will immediately
terminate and the associated policyAction will not be executed
on the current element.
This function returns the value of the integer-valued MIB
instance.
It is recommended that NMS user interfaces display and allow
input of MIB object names by their descriptor values followed
by the index in dotted-decimal form (e.g., "ifType.7).
8.1.1.2. getvar()
The getvar() function is used to retrieve the value of an SNMP
MIB instance.
u_char * getvar(char *oid, u_char *value, u_char *length)
Oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
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if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
The agent will retrieve the instance in the same SNMP context
in which the element resides. Note that no actual SNMP PDU
needs to be generated and parsed when the policy MIB module
resides on the same system as the managed elements.
If the queried object identifier value does not exist
execution of the containing expression on the current
element will immediately terminate and the associated
policyAction will not be executed on the current element.
This function returns a string containing the returned value,
encoded according to the returned type.
The optional arguments value and length will be filled in with
the returned type and length if supplied. If the variable
being retrieved is not a null-terminated type, it will be
necessary to retrieve the length argument.
It is recommended that NMS user interfaces display and allow
input of MIB object names by their descriptor values followed
by the index in dotted-decimal form (e.g., "ifType.7).
8.1.1.3. exists()
The exists() function is used to verify the existence of an
SNMP MIB instance.
int exists(char *oid)
oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
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The agent will retrieve the instance in the same SNMP context
in which the element resides. Note that no actual SNMP PDU
needs to be generated and parsed when the policy MIB module
resides on the same system as the managed elements.
This function returns the value 1 if the SNMP instance exists
and 0 if it doesn't exist.
It is recommended that NMS user interfaces display and allow
input of MIB object names by their descriptor values followed
by the index in dotted-decimal form (e.g., "ifType.7).
8.1.1.4. setint()
The setint() function is used to set a MIB instance to a
certain integer value. The setint() function is only valid in
policyActions. If when executing a policyFilter, the agent
encounters a call to the setint() function, execution of the
policyFilter for the current element will immediately
terminate and the associated policyAction will not be executed
on the current element.
int setint(char *oid, int value)
oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
The agent will set the variable specified by oid
to the integer value specified by value.
The agent will set the instance in the same SNMP context
in which the element resides. Note that no actual SNMP PDU
needs to be generated and parsed when the policy MIB module
resides on the same system as the managed elements.
If the set encounters any error, 0 is returned. If sucessful,
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1 is returned.
It is recommended that NMS user interfaces display and allow
input of MIB object names by their descriptor values followed
by the index in dotted-decimal form (e.g., "ifType.7).
8.1.1.5. setvar()
The setvar() function is used to set a MIB instance to a
certain value. The setvar() function is only valid in
policyActions. If when executing a policyFilter, the agent
encounters a call to the setvar() function, execution of the
policyFilter for the current element will immediately
terminate and the associated policyAction will not be executed
on the current element.
int setvar(char *oid, u_char *value, int length, int type)
oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
value is a string encoded in the format appropriate to the
type parameter. The agent will set the variable specified by
oid to the value specified by value.
length is the length in octets of the value parameter.
type is the type of the value parameter and will be one of the
DataType Constants.
The agent will set the instance in the same SNMP context
in which the element resides. Note that no actual SNMP PDU
needs to be generated and parsed when the policy MIB module
resides on the same system as the managed elements.
If the set encounters any error, 0 is returned. If sucessful,
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1 is returned.
It is recommended that NMS user interfaces display and allow
input of MIB object names by their descriptor values followed
by the index in dotted-decimal form (e.g., "ifType.7).
8.1.1.6. searchcolumn()
char *searchcolumn(char *columnoid, char *startoid,
u_char *value, int type)
searchcolumn performs an SNMP walk on a portion of the MIB
searching for objects that who's values match value.
columnoid constrains the search to only those variables that
are beneath it in the tree.
startoid is the first to send in the search
value is the value to be searched for. When a value is found
that matches exactly, searchcolumn returns with the oid of the
variable.
type describes the type of the value to be matched.
For example:
To find an ethernet
searchcolumn("ifType", "ifType", 6, TYPE_INTEGER);
This sends a getnext request for ifType and continues to walk
the tree until a value matching 6 is found or a variable
returns that is not in the 'ifType' subtree.
To find the next ethernet, assuming interface #3 was
discovered to be the first:
searchcolumn("ifType", "ifType.3", 6, TYPE_INTEGER);
8.1.1.7. setRowStatus()
int setRowStatus(char *oid, int maxTries)
setRowStatus is used to automate the process of finding an
unused row in a read-create table that uses RowStatus.
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oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier,
with one of the subids replaced with a '*' character
(e.g. "1.3.6.1.3.1.99.1.2.1.9.*"). The oid must reference an
'instance' of the RowStatus object and the '*' must replace
any integer index item that may be set to some random value.
setRowStatus will come up with a random number for the
selected index item and will attempt to create the instance
with the createAndWait state. If the attempt fails, it will
retry with a different random index value. It will attempt
this no more than maxTries times.
setRowStatus returns the successful integer value for the
index. If unsuccessful after maxTries, -1 will be returned.
8.1.2. General SNMP Functions
It is desireable for a general SNMP interface have the ability
to perform SNMP operations on multiple variables at once and
for it to allow multiple varbind lists to be active at once.
The readVarbind and writeVarbind functions exist in order to
provide these facilities in a language without pointers,
arrays and memory allocators.
readVarbind and writeVarbind access a data store of variable
length varbindlists. The index of the varbindlist and the
index of the variable within that varbindlist are specified in
every readVarbind and writeVarbind operation. Once a
varbindlist has been fully specified by one or more calls to
writeVarbind, it is passed to snmpsend (by referencing the
varbindlist index) and the number of varbinds to be included
in the operation. The results are stored in the same
varbindlist (i.e. the same varbindlist index is used) and may
be read by one or more calls to readVarbind.
Varbinds in this data store are created automatically whenever
they are written or read by any writeVarbind, readVarbind,
snmpsend, or trapsend operation. It is not a runtime error to
read a varbind that has not been previously written, however
the values read will be unpredictable.
For example:
writeVarbind(0, 0, "sysDescr.0", ...);
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writeVarbind(0, 1, "sysOID.0", ...);
writeVarbind(0, 2, "ifNumber.0", ...);
snmpsend(0, 3, GET, ...);
readVarbind(0, 0, iKnowItsSysDescr, iKnowItsaString, len, value);
readVarbind(0, 1, ...)
readVarbind(0, 2, ...)
...
or,
writeVarbind(0, 0, "ifIndex", ...);
writeVarbind(0, 1, "ifType", ...);
while(!done){
snmpsend(0, 2, GETNEXT, ...);
readVarbind(0, 0, oid1, ...);
readVarbind(0, 1, oid2, ...);
/* leave OIDs alone, now varbindlist #0 is set up for next step
in table walk. */
if (!oid_in(oid1, "ifIndex"))
done = 0;
...
}
To be conformant to this specification, implementations must
support at least 5 varbindlists with at least 60 varbinds per
list.
Implementations may, but are not required, to initialize the
varbind database when a new expression begins executing. An
expression invocation can only depend on the state it has
written into this datastore.
8.1.2.1. writeVarbind()
void writeVarbind(int varbindListIndex, int varBindIndex,
char *oid, int *type, u_char *value, int length)
writeVarbind will store the oid, the value and it's type and
length in the specified varbind.
varbindListIndex is a non-negative integer that identifies the
varbindList modified by this call.
varbindIndex is a non-negative integer that identifies the
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varbind within the varbindList modified by this call.
oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
The 2-character token "$n" ('$' followed by an integer) can be
used in place of any decimal sub-identifier. This token is
expanded by the agent at execution time to contain the n'th
subid of the index for the current element. For example,
if the element is interface #7, and the objectIdentifier is
"1.3.6.1.2.1.2.2.1.3.$1", it will be expanded to
"1.3.6.1.2.1.2.2.1.3.7".
type is the type of the value parameter and should be set to
one of the values for DataType Constants.
value is a string encoded in the format appropriate to the
type parameter.
length is the length in octets of the value parameter.
8.1.2.2. readVarbind()
void readVarbind(int varbindListIndex, int varBindIndex,
char *oid, int *type, u_char *value, int *length)
writeVarbind will retrieve the oid, the value and it's type
and length from the specified varbind.
varbindListIndex is a non-negative integer that identifies the
varbindList read by this call.
varbindIndex is a non-negative integer that identifies the
varbind within the varbindList read by this call.
oid is a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0"). The object identifier value of the
referenced varbind will be copied into this string.
type is the type of the value parameter and will be set to
one of the values for DataType Constants.
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value is a string encoded in the format appropriate to the
type parameter.
length is the length in octets of the value parameter.
8.1.2.3. snmpsend()
int snmpsend(int varbindListIndex, int numVarbinds, int opcode)
snmpsend will perform an SNMP operation using the specified
varbindlist. Note that no actual SNMP PDU needs to be
generated and parsed when the policy MIB module
resides on the same system as the managed elements.
The results of the operation will be placed in the same
varbindList unless an error occurred, in which case no
varbinds are modified.
This function returns zero unless an error occurs in which
case it returns the proper SNMP Error Constant.
varbindListIndex is a non-negative integer that identifies the
varbindList used by this operation.
numVarbinds is a integer greater than zero that specified
which varbinds in the varbindList will be used in this
operation. The first N varbinds in the varbindList are used.
opcode is the type of SNMP operation to perform and must be
one of the values for SNMP Operation Constants.
8.2. Constants
The following constants are defined for use in all SNMP Access
Functions. Expressions will be executed in an environment
where the following definitions are active. (Note that neither
these definitions or the macro replacements they dictate will
be visible in the policyFilter or policyAction MIB objects.)
-- Datatype Constants
#define TYPE_INTEGER 1
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#define TYPE_OCTET_STRING 2
#define TYPE_OBJECT_IDENTIFIER 3
#define TYPE_INTEGER32 4
#define TYPE_IPADDRESS 5
#define TYPE_COUNTER32 6
#define TYPE_GAUGE32 7
#define TYPE_UNSIGNED32 8
#define TYPE_TIMETICKS 9
#define TYPE_OPAQUE 10
#define TYPE_COUNTER64 11
-- SNMP Error Constants
#define ERROR_NOSUCHOBJECT 12
#define ERROR_NOSUCHINSTANCE 13
#define ERROR_ENDOFMIBVIEW 14
#define ERROR_NOERROR 15
#define ERROR_TOOBIG 16
#define ERROR_NOSUCHNAME 17
#define ERROR_BADVALUE 18
#define ERROR_READONLY 19
#define ERROR_GENERR 20
#define ERROR_NOACCESS 21
#define ERROR_WRONGTYPE 22
#define ERROR_WRONGLENGTH 23
#define ERROR_WRONGENCODING 24
#define ERROR_WRONGVALUE 25
#define ERROR_NOCREATION 26
#define ERROR_INCONSISTENTVALUE 27
#define ERROR_RESOURCEUNAVAILABLE 28
#define ERROR_COMMITFAILED 29
#define ERROR_UNDOFAILED 30
#define ERROR_AUTHORIZATIONERROR 31
#define ERROR_NOTWRITABLE 32
#define ERROR_BADPARAMETER 33
#define ERROR_TOOLONG 34
#define ERROR_PARSEERROR 35
#define ERROR_AUTHFAILURE 36
#define ERROR_TIMEOUT 37
-- SNMP Operation Constants
#define OP_GET 0
#define OP_GETNEXT 1
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#define OP_SET 3
#define OP_TRAP 4
#define OP_INFORM 6
#define OP_V2TRAP 7
8.3. Policy Configuration Access Functions
Policy Configuration Access Functions provide access to
information specifically related to the execution of policies.
8.3.1. roleMatch()
The roleMatch() function is used to check to see if the
current element has been assigned a particular role.
int roleMatch(u_char *roleString)
Argument roleString is a NULL terminated string. If this
exactly matches (content and length) any role assigned to the
current element, the function returns 1. If no roles match,
the function returns 0.
8.3.2. capMatch()
The capMatch() function is used to check to see if the current
element has a certain capability.
int capMatch(char *capString)
Argument capability is a NULL terminated string containing a
ASCII dotted-decimal representation of an object identifier
that describes a capability as would be found in the
pmCapabilitiesTable.
If the current element has the capability described by
capString, this function returns 1, otherwise it returns 0.
8.3.3. elementName()
The elementName() function is used to determine what the
current element is and can be used to provide information
about the type of element as well as how it is indexed.
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char * elementName(void)
elementName returns a NULL terminated string containing an
ASCII dotted-decimal representation of an object identifier
(e.g. 1.3.6.1.2.1.1.1.0). This object identifier identifies an
instance of a MIB object that is an attribute of this
element.
8.3.4. setScratchpad()
setScratchpad(int varIndex, char *value, int length)
Every maxLatency time period, every policy runs once for each
element. The setScratchpad function allows values to be stored
that will live beyond the end of this policy execution so that
they can be retrieved by subsequent invocations of this policy
on "this element".
varIndex is a positive integer used to allows variables to be
stored in one policy/element context.
value the value to be stored.
length is the length of the value.
8.3.5. getScratchpad()
int getScratchpad(int varIndex, char *value, int *length)
The getScratchpad function allows retrieval of values that
were stored in previous executions of this policy on this
element.
varIndex is a positive integer used to allows variables to be
stored in one policy/element context.
On successful return, value will be set to the value that was
previously stored and length will be set to its length.
8.4. Utility Accessor Functions
Utility Accessor Functions are provided to enable more
efficient use of the other accessor functions.
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8.4.1. oidlength()
int oidlen(char *oid)
oidlen returns the number of subidentifiers in oid. oid is a
NULL terminated string containing an ASCII dotted-decimal
representation of an object identifier
(e.g. "1.3.6.1.2.1.1.1.0").
8.4.2. oidncmp()
int oidncmp(char *oid1, char *oid2)
Arguments oid1 and oid2 are NULL terminated strings containing
ASCII dotted-decimal representations of object identifiers
(e.g. "1.3.6.1.2.1.1.1.0").
Compares the first n subidentifiers of oid1 and oid2 and
returns -1 if oid1 is less than oid2, 0 if they are equal, and
1 if oid1 is greater than oid2.
8.4.3. subid()
int subid(char *oid, int n)
subid returns the value of the n'th (starting at zero)
subidentifier of oid. oid is a NULL terminated string
containing an ASCII dotted-decimal representation of an object
identifier (e.g. "1.3.6.1.2.1.1.1.0").
If n specifies a subidentifier beyond the length of oid, a
value of -1 is returned.
8.4.4. oidsplice()
char *oidsplice(char *oid1, int m, char *oid2, int n)
oidsplice replaces n subidentifiers in oid1 with those from
oid2, starting at the m'th subidentifier in oid1. The
resulting oid is returned.
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8.5. Library Accessor Functions
The following standard library accessor functions are
provided:
strncmp()
strncasecmp()
strncat()
strlen()
strncpy()
atoi()
random()
memcmp()
memmove()
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9. Definitions
POLICY-MANAGEMENT-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
Counter32, Integer32, Gauge32, Unsigned32,
experimental FROM SNMPv2-SMI
RowStatus, RowPointer, TEXTUAL-CONVENTION FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
-- Policy-Based Management MIB
policyMgt MODULE-IDENTITY
LAST-UPDATED "200010111500Z" -- October 11, 2000
ORGANIZATION "IETF SNMP Configuration Working Group"
CONTACT-INFO
"Steve Waldbusser
Phone: +1-650-948-6500
Fax: +1-650-745-0671
Email: waldbusser@nextbeacon.com
Jon Saperia
JDS Consulting, Inc.
174 Chapman St.
Watertown MA 02472-3063
USA
Phone: +1-617-744-1079
Fax: +1-617-249-0874
Email: saperia@jdscons.com
Thippanna Hongal
Riverstone Networks, Inc.
5200 Great America Parkway
Santa Clara, CA, 95054
USA
Phone: +1-408-878-6562
Fax: +1-408-878-6501
Email: hongal@riverstonenet.com"
DESCRIPTION
"The MIB module for rule-based configuration of SNMP
infrastructures."
REVISION "200010111500Z" -- October 11, 2000
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DESCRIPTION
"The original version of this MIB, published as RFCXXXX."
::= { experimental 107 }
UTF8String ::= TEXTUAL-CONVENTION
DISPLAY-HINT "255a"
STATUS current
DESCRIPTION
"An octet string containing information typically in
human-readable form.
To facilitate internationalization, this
information is represented using the ISO/IEC
IS 10646-1 character set, encoded as an octet
string using the UTF-8 transformation format
described in [RFC2279].
Since additional code points are added by
amendments to the 10646 standard from time
to time, implementations must be prepared to
encounter any code point from 0x00000000 to
0x7fffffff. Byte sequences that do not
correspond to the valid UTF-8 encoding of a
code point or are outside this range are
prohibited.
The use of control codes should be avoided.
When it is necessary to represent a newline,
the control code sequence CR LF should be used.
For code points not directly supported by user
interface hardware or software, an alternative
means of entry and display, such as hexadecimal,
may be provided.
For information encoded in 7-bit US-ASCII,
the UTF-8 encoding is identical to the
US-ASCII encoding.
UTF-8 may require multiple bytes to represent a
single character / code point; thus the length
of this object in octets may be different from
the number of characters encoded. Similarly,
size constraints refer to the number of encoded
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octets, not the number of characters represented
by an encoding.
Note that when this TC is used for an object that
is used or envisioned to be used as an index, then
a SIZE restriction MUST be specified so that the
number of sub-identifiers for any object instance
does not exceed the limit of 128, as defined by
[RFC1905].
Note that the size of an UTF8String object is
measured in octets, not characters."
SYNTAX OCTET STRING
-- The policy group
pmPolicyTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmPolicyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The policy table. A policy is a pairing of a
policyFilter and a policyAction which is used to apply the
action to a selected set of elements."
::= { policyMgt 1 }
pmPolicyEntry OBJECT-TYPE
SYNTAX PmPolicyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the policy table."
INDEX { pmPolicyIndex }
::= { pmPolicyTable 1 }
PmPolicyEntry ::= SEQUENCE {
pmPolicyIndex Unsigned32,
pmPolicyFilter UTF8String,
pmPolicyCalendar RowPointer,
pmPolicyAction UTF8String,
pmPolicyFilterMaxLatency Unsigned32,
pmPolicyActionMaxLatency Unsigned32,
pmPolicyPrecedence Unsigned32,
pmPolicyGroup UTF8String,
pmPolicyDescription UTF8String,
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pmPolicyMatches Gauge32,
pmPolicyExecutionErrors Counter32,
pmPolicyDebugging INTEGER,
pmPolicyStatus RowStatus
}
pmPolicyIndex OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A unique index for this policy entry."
::= { pmPolicyEntry 1 }
pmPolicyFilter OBJECT-TYPE
SYNTAX UTF8String
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A policyFilter is an expression which results in a boolean
value which represents whether or not an element is a member
of a set of elements upon which an action is to be
performed.
The format of this expression is the policy expression
language. Filter evaluation stops immediately when any error
is detected without executing the policyAction.
The policyFilter is evaluated for various elements. Any
element for which the policyFilter returns any nonzero value
will match the filter and will have the associated
policyAction executed on that element."
::= { pmPolicyEntry 2 }
pmPolicyCalendar OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A pointer to an entry in the schedTable of the Scheduling
MIB [20]. This policy is active when specified by the
associated schedule entry.
If the value of this object is 0.0, this policy is always
active."
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::= { pmPolicyEntry 3 }
pmPolicyAction OBJECT-TYPE
SYNTAX UTF8String
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A pmPolicyAction is an operation performed on a set of
elements. The format of this expression is the policy
expression language.
Action evaluation stops immediately when any error is
detected."
::= { pmPolicyEntry 4 }
pmPolicyFilterMaxLatency OBJECT-TYPE
SYNTAX Unsigned32
UNITS "milliseconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Every element under the control of this agent is
re-checked periodically to see if it is under control of this
policy by re-running the filter expression for this policy.
This object lets the manager control the maximum amount of
time that may pass before an element is re-checked.
In other words, in any given interval of this duration, all
elements must be re-checked. Note that it is an
implementation-dependent matter as to how the policy agent
schedules the checking of various elements within this
interval."
::= { pmPolicyEntry 5 }
pmPolicyActionMaxLatency OBJECT-TYPE
SYNTAX Unsigned32
UNITS "milliseconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Every element that matches this policy's filter and is
therefore under control of this policy will have this policy's
action executed periodically to ensure that the element
remains in the state dictated by the policy.
This object lets the manager control the maximum amount of
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time that may pass before an element has the action run on
it.
In other words, in any given interval of this duration, all
elements under control of this policy must have the action run
on them. Note that it is an implementation-dependent matter as
to how the policy agent schedules the policy action on various
elements within this interval."
::= { pmPolicyEntry 6 }
pmPolicyPrecedence OBJECT-TYPE
SYNTAX Unsigned32 (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The order in which policies on the local system are
evaluated. A policy with a higher precedence value will
be evaluated after a policy with a lower precedence. For
example, a policy with a precedence value of 999 will be
evaluated after a policy with a precedence value of 998.
These values must be unique on the local policy system
that realizes this module. The value for a particular
policy should be the same across an administrative
domain, though that is not mandatory.
When the local policy system performs the evaluation in the
pmPolicyFilter for the policy identified by this row it will
also read the pmTrackingElementToPolicyStatus object for each
object returned as a result of the policy evaluation. If that
object is set to modified(3), then the pmPolicyAction shall
not be taken on that element.
The value of precedence(4), of pmTrackingElementToPolicyStatus
is an indication that when an evaluation was performed by
another policy, the pmTrackingElementToPolicyStatus was found
to have a value of on(1) and that policy had a higher
precedence value than the policy that initially set the value
of the pmTrackingElementToPolicyStatus to on(1). In this
event, the pmTrackingElementToPolicyPrecedence object shall
have the value of the pmPolicyIndex for the policy with the
higher precedence value entered. If the policy identified by
this row of the pmPolicyTable has a higher precedence value
than the value found in pmTrackingElementToPolicyPrecedence
then the pmPolicyAction should be performed on the element and
the pmTrackingElementToPolicyPrecedence object updated with
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the value of the pmPolicyIndex for this policy. The only
exception to these rules is when the policy that has the
higher precedence value in not currently running, i.e., the
schedule is off."
::= { pmPolicyEntry 7 }
pmPolicyGroup OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..32))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"An administratively assigned string that is used to group
policies. Any combination is legal, the pmPolicyGroup object
does not constrain precedence. That is precedence is evaluated
independent of grouping though adminstrators might group
related policies together for clarity."
::= { pmPolicyEntry 8 }
pmPolicyDescription OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..255))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A description of this rule and its significance, typically
provided by a human."
::= { pmPolicyEntry 9 }
pmPolicyMatches OBJECT-TYPE
SYNTAX Gauge32
UNITS "elements"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of elements that are currently matched by the
associated pmPolicyFilter."
::= { pmPolicyEntry 10 }
pmPolicyExecutionErrors OBJECT-TYPE
SYNTAX Counter32
UNITS "errors"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times execution of this policy has been
terminated due to run-time errors."
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::= { pmPolicyEntry 11 }
pmPolicyDebugging OBJECT-TYPE
SYNTAX INTEGER {
off(0),
on(1)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of debugging for this policy. If this is turned
on(1), log entries will be created in the pmDebuggingTable
for each run-time error that is experienced by this policy."
DEFVAL { off }
::= { pmPolicyEntry 12 }
pmPolicyStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this pmPolicyEntry."
::= { pmPolicyEntry 13 }
-- Element Type Registration Table
-- The Element Type Registration table is used for the manager to
-- learn what element types are being managed by the system and to
-- register new types if necessary. An element type is registered by
-- providing the OID of an SNMP object (i.e., without the
-- instance). Each SNMP instance that exists under that object is a
-- distinct element. The address of the element is the index part of
-- the discovered OID. This address will be supplied to policy filters
-- and actions so that these expressions can inspect and configure the
-- element.
--
-- Before registering an element type, it is the responsibility of a
-- manager to inspect the table and see if it is already registered
-- (by the agent or another manager). Note that entries that differ
-- only in the last OID (which specifies which object in an entry) are
-- effectively duplicates and should be treated as such by the
-- manager.
pmElementTypeRegTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmElementTypeRegEntry
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MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A registration table for element types managed by this
system."
::= { policyMgt 2 }
pmElementTypeRegEntry OBJECT-TYPE
SYNTAX PmElementTypeRegEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A registration of an element type."
INDEX { pmElementTypeRegIndex }
::= { pmElementTypeRegTable 1 }
PmElementTypeRegEntry ::= SEQUENCE {
pmElementTypeRegIndex Unsigned32,
pmElementTypeRegOIDPrefix OBJECT IDENTIFIER,
pmElementTypeRegName UTF8String,
pmElementTypeRegRowStatus RowStatus
}
pmElementTypeRegIndex OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A unique index for this entry."
::= { pmElementTypeRegEntry 1 }
pmElementTypeRegOIDPrefix OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"An OBJECT IDENTIFIER subtree under which all instances of
this element type may be found.
This OBJECT IDENTIFIER should be specified up to, but not
including, any index objects. The agent will discover all
instances in the system that are members of the specified
subtree. It will then execute policy filters (and potentially
policy actions) for each instance discovered.
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Each invocation of the policy filter will be supplied with a
parameter. This is derived by taking the last N
sub-identifiers from the discovered instance, where N is:
X = number of sub-identifiers in pmElementTypeRegOIDPrefix
Y = number of sub-identifiers in discovered instance
N = Y - X
"
::= { pmElementTypeRegEntry 2 }
pmElementTypeRegName OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..32))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A descriptive label for this registered type."
::= { pmElementTypeRegEntry 3 }
pmElementTypeRegRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this registration entry."
::= { pmElementTypeRegEntry 4 }
-- roleTable
-- The Role Table associates role strings to elements. It is the
-- responsibility of the agent to keep track of any re-indexing of the
-- underlying SNMP variables and to continue to associate role strings
-- with the element with which they were initially configured.
--
-- The agent must store role string associations in NVRAM.
--
-- The Role String table is visible through 2 SNMP tables. The
-- pmRoleESTable is a read-create table that organized role strings
-- sorted by element. This table is used to create and modify role
-- strings and their associations.
-- The pmRoleSETable is a read-only table that organizes role strings
-- sorted by string. This table is read-only.
pmRoleESTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmRoleESEntry
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MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The role string table with element as the major index."
::= { policyMgt 3 }
pmRoleESEntry OBJECT-TYPE
SYNTAX PmRoleESEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A role string entry associates a role string with an
individual element."
INDEX { pmRoleESElement, pmRoleESString }
::= { pmRoleESTable 1 }
PmRoleESEntry ::= SEQUENCE {
pmRoleESElement RowPointer,
pmRoleESString UTF8String,
pmRoleESStatus RowStatus
}
pmRoleESElement OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The element to which this role string is associated.
If the agent assigns new indexes in the MIB table to
represent the same underlying element (re-indexing), the
agent will modify this value to contain the new index for the
underlying element."
::= { pmRoleESEntry 1 }
pmRoleESString OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..64))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The role string that is associated with an element through
this table.
A role string is an administratively specified characteristic
of a managed element (for example, an interface). It is a
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selector for policy rules, to determine the applicability of
the rule to a particular managed element."
::= { pmRoleESEntry 2 }
pmRoleESStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this role string."
::= { pmRoleESEntry 3 }
pmRoleSETable OBJECT-TYPE
SYNTAX SEQUENCE OF PmRoleSEEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A read-only version of the role string table with
roleString as the major index. The purpose of this
table is to make it easy to retrieve all elements that
share a common string."
::= { policyMgt 4 }
pmRoleSEEntry OBJECT-TYPE
SYNTAX PmRoleSEEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A role string entry associates a role string with an
individual element."
INDEX { pmRoleSEString, pmRoleSEElement }
::= { pmRoleSETable 1 }
PmRoleSEEntry ::= SEQUENCE {
pmRoleSEString UTF8String,
pmRoleSEElement RowPointer
}
pmRoleSEString OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..64))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The role string that is associated with an element through
this table.
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A role string is an administratively specified characteristic
of a managed element (for example, an interface). It is a
selector for policy rules, to determine the applicability of
the rule to a particular managed element."
::= { pmRoleSEEntry 1 }
pmRoleSEElement OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The element to which this role string is associated.
If the agent assigns new indexes in the MIB table to
represent the same underlying element (re-indexing), the
agent will modify this value to contain the new index for the
underlying element."
::= { pmRoleSEEntry 2 }
-- Capabilities table
-- Note that with this table it is not necessary to list all OIDs that
-- a mechanism specific MIB Module supports, just the base OID if
-- the implementation is a fully compliant one. If the implementation
-- is not, then additional rows will exist in the table that list
-- the limitations or enhancements.
pmCapabilitiesTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmCapabilitiesEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The pmCapabilitiesTable contains a description of
the inherent capabilities of the system."
::= { policyMgt 5 }
pmCapabilitiesEntry OBJECT-TYPE
SYNTAX PmCapabilitiesEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The description of a capability or limitation of a
capability of the system. An entry will exist for each
domain and mechanism specific ability the system has. In
the case of a domain specific capability with no mechanism
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specific parameters, the pmCapabilitiesSubType and all other
columns may be null. Entries will exist that contain
values for the pmCapabilitiesRestrictOID,
pmCapabilitiesRestrictType, pmCapabilitiesRestrictValue
and pmCapabilitiesRestrictString objects only when
an implementation is reporting a mechanism specific
restriction. Multiple entries are possible when more
than one restriction for a type or subtype are needed."
INDEX { pmCapabilitiesIndex }
::= { pmCapabilitiesTable 1 }
PmCapabilitiesEntry ::= SEQUENCE {
pmCapabilitiesIndex Unsigned32,
pmCapabilitiesType OBJECT IDENTIFIER,
pmCapabilitiesSubType OBJECT IDENTIFIER,
pmCapabilitiesModificationOID OBJECT IDENTIFIER,
pmCapabilitiesModificationType INTEGER,
pmCapabilitiesModificationValue Integer32,
pmCapabilitiesModificationString OCTET STRING
}
pmCapabilitiesIndex OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A unique index for this entry."
::= { pmCapabilitiesEntry 1 }
pmCapabilitiesType OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of the capability represented by this entry.
The IANA will publish the list of identifiers that are valid
values for this object."
::= { pmCapabilitiesEntry 2 }
pmCapabilitiesSubType OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The sub type of capability is a pointer to a mechanism specific
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set of capabilities supporting a base technology. In the case of
DIFFSERV, the OID value here would be the base OID of the
Differentiated Services Policy MIB Module."
::= { pmCapabilitiesEntry 3 }
pmCapabilitiesModificationOID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The OID of the object that is either not supported, supported
with one or more limitations, or expanded by an implementation
specific module. If this columnar object is other than null then
there must be at least an entry in pmCapabilitiesModificationType.
Note that this need not be a leaf node or scalar object. If
an entire table is not supported, this value can be the base OID
for the table."
::= { pmCapabilitiesEntry 4 }
pmCapabilitiesModificationType OBJECT-TYPE
SYNTAX INTEGER {
unsupported(0),
restricted(1),
additional(2),
addvalue(3),
maxlimit(4),
minlimit(5)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An unsupported value indicates that the OID in
pmCapabilitiesModificationOID is not supported on
this system. A value of 1 indicates that the OID
is supported but with restricted values
These constraints are described in the
pmCapabilitiesModificationValue and
pmCapabilitiesModificationString objects. A value of
2 indicates a vendor specific extension to a standard.
The OID of the new object is pmCapabilitiesModificationOID.
For some implementations, additional functions may be
provided. addvalue indicates that this row of the table
describes an additional value that the object can take.
The specific value is in the pmCapabilitiesModificationValue.
The values of 4 and 5 indicate restrictions or the removal
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of restrictions for the object identified."
::= { pmCapabilitiesEntry 5 }
pmCapabilitiesModificationValue OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If the value of pmCapabilitiesModificationType is 0, this
object will be null since 0 indicates no support for the
object at all. A value of 1 in the
pmCapabilitiesModificationType will be further modified by a
single integer value in this object that corresponds to
enumerated integer values that are not supported by the
system for the object that is identified in this row. This
value can also represent the limit values in the
pmCapabilitiesModificationType object."
::= { pmCapabilitiesEntry 6 }
pmCapabilitiesModificationString OBJECT-TYPE
SYNTAX OCTET STRING
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Any additional details or description or parameters needed."
::= { pmCapabilitiesEntry 7 }
-- Policy Tracking
pmTrackingPolicyToElementTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmTrackingPolicyToElementEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The pmTrackingPolicyToElementTable describes what elements
are under control of a policy."
::= { policyMgt 6 }
pmTrackingPolicyToElementEntry OBJECT-TYPE
SYNTAX PmTrackingPolicyToElementEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the pmTrackingPolicyToElementTable. The
pmPolicyIndex in the index specifies the policy tracked by
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this entry."
INDEX { pmPolicyIndex, pmTrackingPolicyToElementElement }
::= { pmTrackingPolicyToElementTable 1 }
PmTrackingPolicyToElementEntry ::= SEQUENCE {
pmTrackingPolicyToElementElement RowPointer,
pmTrackingPolicyToElementStatus INTEGER
}
pmTrackingPolicyToElementElement OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The element this policy is configuring."
::= { pmTrackingPolicyToElementEntry 1 }
pmTrackingPolicyToElementStatus OBJECT-TYPE
SYNTAX INTEGER {
off(0),
on(1)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The status of this policy-element relationship. This value
will be 1 if the associated policyFilter returned 1 for this
element and if the calendar for the policy is active.
Entries will only exist in this table if their status is
on(1). Thus, on(1) is the only value of this object that can
be retrieved. This object exists so that it can serve as the
'payload' in the varbind instead of the
pmTrackingPolicyToElementElement object which is much longer
and is already in the index (it would otherwise be
duplicated)."
::= { pmTrackingPolicyToElementEntry 2 }
-- Element to Policy Table
pmTrackingElementToPolicyTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmTrackingElementToPolicyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
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"The pmTrackingElementToPolicyTable describes what policies
are controlling an element."
::= { policyMgt 7 }
pmTrackingElementToPolicyEntry OBJECT-TYPE
SYNTAX PmTrackingElementToPolicyEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the pmTrackingElementToPolicyTable. The
pmPolicyIndex in the index specifies the policy tracked by
this entry."
INDEX { pmTrackingElementToPolicyElement, pmPolicyIndex }
::= { pmTrackingElementToPolicyTable 1 }
PmTrackingElementToPolicyEntry ::= SEQUENCE {
pmTrackingElementToPolicyElement RowPointer,
pmTrackingElementToPolicyStatus INTEGER
}
pmTrackingElementToPolicyElement OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The element this policy is configuring."
::= { pmTrackingElementToPolicyEntry 1 }
pmTrackingElementToPolicyStatus OBJECT-TYPE
SYNTAX INTEGER {
off(0),
on(1),
forceOff(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The status of this policy-element relationship. This value
will be 1 if the associated policyFilter returned 1 for this
element and if the calendar for the policy is active.
Entries will not exist in this table if their status would be
off(0).
A policy can be forcibly disabled on a particular element
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by setting this value to forceOff(2). The agent should then
act as if the policyFilter failed for this element. The
forceOff(2) state will persist (even across reboots) until
this value is set to on(1) by a management request. Even if
the policyFilter later fails for this element, this value
will stay in the forceOff(2) state."
::= { pmTrackingElementToPolicyEntry 2 }
-- Policy Debugging Table
-- Policies that have debugging turned on will generate a log entry in
-- the policy debugging table for every runtine error that occurs in
-- either the filter or action expression.
pmDebuggingTable OBJECT-TYPE
SYNTAX SEQUENCE OF PmDebuggingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The pmDebuggingPolicyTable logs debugging messages when
policies experience runtime errors."
::= { policyMgt 8 }
pmDebuggingEntry OBJECT-TYPE
SYNTAX PmDebuggingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the pmDebuggingTable. The pmPolicyIndex in the
index specifies the policy that encountered the error that
led to this log entry."
INDEX { pmPolicyIndex, pmDebuggingElement,
pmDebuggingLogIndex }
::= { pmDebuggingTable 1 }
PmDebuggingEntry ::= SEQUENCE {
pmDebuggingElement RowPointer,
pmDebuggingLogIndex Unsigned32,
pmDebuggingMessage UTF8String
}
pmDebuggingElement OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
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DESCRIPTION
"The element the policy was executing on when it encountered
the error that led to this log entry."
::= { pmDebuggingEntry 1 }
pmDebuggingLogIndex OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A unique index for this log entry amongst other log entries
for this policy/element combination."
::= { pmDebuggingEntry 2 }
pmDebuggingMessage OBJECT-TYPE
SYNTAX UTF8String (SIZE (0..128))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An error message generated by the expression runtime system."
::= { pmDebuggingEntry 3 }
-- Compliance Statements
pmConformance OBJECT IDENTIFIER ::= { policyMgt 20 }
pmCompliances OBJECT IDENTIFIER ::= { pmConformance 1 }
pmGroups OBJECT IDENTIFIER ::= { pmConformance 2 }
pmCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Describes the requirements for conformance to
the Policy-Based Management MIB"
MODULE -- this module
MANDATORY-GROUPS { pmPolicyManagementGroup }
::= { pmCompliances 1 }
pmPolicyManagementGroup OBJECT-GROUP
OBJECTS { pmPolicyFilter, pmPolicyCalendar, pmPolicyAction,
pmPolicyFilterMaxLatency, pmPolicyActionMaxLatency,
pmPolicyPrecedence, pmPolicyGroup,
pmPolicyDescription, pmPolicyMatches,
pmPolicyExecutionErrors, pmPolicyDebugging,
pmPolicyStatus,
pmElementTypeRegOIDPrefix,
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pmElementTypeRegName, pmElementTypeRegRowStatus,
pmRoleESStatus, pmRoleSEElement, pmCapabilitiesType,
pmCapabilitiesSubType, pmCapabilitiesModificationOID,
pmCapabilitiesModificationType,
pmCapabilitiesModificationValue,
pmCapabilitiesModificationString,
pmTrackingPolicyToElementStatus,
pmTrackingElementToPolicyStatus,
pmDebuggingElement, pmDebuggingLogIndex,
pmDebuggingMessage }
STATUS current
DESCRIPTION
"Objects that allow for the creation and management of
configuration policies."
::= { pmGroups 1 }
pmBaseFunctionLibrary OBJECT IDENTIFIER ::= { pmGroups 2 }
END
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10. Security Considerations
There are a number of management objects defined in this MIB
that have a MAX-ACCESS clause of read-write and/or read-
create. Such objects may be considered sensitive or
vulnerable in some network environments. The support for SET
operations in a non-secure environment without proper
protection can have a negative effect on network operations.
SNMPv1 by itself is not a secure environment. Even if the
network itself is secure (for example by using IPSec), even
then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the
objects in this MIB.
It is recommended that the implementors consider the security
features as provided by the SNMPv3 framework. Specifically,
the use of the User-based Security Model RFC 2574 [12] and the
View-based Access Control Model RFC 2575 [15] is recommended.
It is then a customer/user responsibility to ensure that the
SNMP entity giving access to an instance of this MIB, is
properly configured to give access to the objects only to
those principals (users) that have legitimate rights to indeed
GET or SET (change/create/delete) them.
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11. References
[1] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing SNMP Management Frameworks",
RFC 2571, April 1999.
[2] Rose, M., and K. McCloghrie, "Structure and
Identification of Management Information for TCP/IP-based
Internets", STD 16, RFC 1155, May 1990.
[3] Rose, M., and K. McCloghrie, "Concise MIB Definitions",
STD 16, RFC 1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with
the SNMP", RFC 1215, March 1991.
[5] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
[6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.
[7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.
[8] Case, J., Fedor, M., Schoffstall, M., and J. Davin,
"Simple Network Management Protocol", STD 15, RFC 1157,
May 1990.
[9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC 1901,
January 1996.
[10] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Transport Mappings for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1906, January 1996.
[11] Case, J., Harrington D., Presuhn R., and B. Wijnen,
"Message Processing and Dispatching for the Simple
Network Management Protocol (SNMP)", RFC 2572, April
1999.
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[12] Blumenthal, U., and B. Wijnen, "User-based Security Model
(USM) for version 3 of the Simple Network Management
Protocol (SNMPv3)", RFC 2574, April 1999.
[13] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Protocol Operations for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1905, January 1996.
[14] Levi, D., Meyer, P., and B. Stewart, "SNMPv3
Applications", RFC 2573, April 1999.
[15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
Access Control Model (VACM) for the Simple Network
Management Protocol (SNMP)", RFC 2575, April 1999.
[16] McCloghrie, K. and M. Rose, Editors, "Management
Information Base for Network Management of TCP/IP-based
internets: MIB-II", STD 17, RFC 1213, Hughes LAN Systems,
Performance Systems International, March 1991.
[17] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB using SMIv2", RFC 2233, Cisco Systems, FTP Software,
November 1997.
[18] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction to Version 3 of the Internet-standard
Network Management Framework", RFC 2570, April 1999.
[19] American National Standards Institute, "C Language
Specification"
[20] Levi, D. and J. Schoenwaelder, "Definitions of Managed
Objects for Scheduling Management Operations", RFC 2591,
May 1999.
12. Intellectual Property
The IETF takes no position regarding the validity or scope of
any intellectual property or other rights that might be
claimed to pertain to the implementation or use of the
technology described in this document or the extent to which
any license under such rights might or might not be available;
neither does it represent that it has made any effort to
identify any such rights. Information on the IETF's
procedures with respect to rights in standards-track and
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standards-related documentation can be found in BCP-11.
Copies of claims of rights made available for publication and
any assurances of licenses to be made available, or the result
of an attempt made to obtain a general license or permission
for the use of such proprietary rights by implementors or
users of this specification can be obtained from the IETF
Secretariat.
The IETF invites any interested party to bring to its
attention any copyrights, patents or patent applications, or
other proprietary rights which may cover technology that may
be required to practice this standard. Please address the
information to the IETF Executive Director.
13. Full Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and
furnished to others, and derivative works that comment on or
otherwise explain it or assist in its implementation may be
prepared, copied, published and distributed, in whole or in
part, without restriction of any kind, provided that the above
copyright notice and this paragraph are included on all such
copies and derivative works. However, this document itself
may not be modified in any way, such as by removing the
copyright notice or references to the Internet Society or
other Internet organizations, except as needed for the
purpose of developing Internet standards in which case the
procedures for copyrights defined in the Internet Standards
process must be followed, or as required to translate it into
languages other than English.
The limited permissions granted above are perpetual and will
not be revoked by the Internet Society or its successors or
assigns.
This document and the information contained herein is provided
on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE
USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR
ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
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Table of Contents
1 Abstract .............................................. 1
2 The SNMP Management Framework ......................... 2
3 Overview .............................................. 4
4 Policy-Based Management Architecture .................. 5
5 Policy Based Management Execution Environment ......... 7
5.1 Element Discovery ................................... 7
5.1.1 Implementation Notes .............................. 8
5.2 Element Filtering ................................... 9
5.2.1 Implementation Notes .............................. 9
5.3 Policy Enforcement .................................. 9
5.3.1 Implementation Notes .............................. 9
6 Policy Based Management Expression Language ........... 11
6.1 Formal Definition ................................... 11
7 Accessor Functions .................................... 13
8 Base Accessor Function Library ........................ 13
8.1 SNMP Access Functions ............................... 13
8.1.1 Convenience SNMP Functions ........................ 15
8.1.1.1 getint() ........................................ 15
8.1.1.2 getvar() ........................................ 16
8.1.1.3 exists() ........................................ 17
8.1.1.4 setint() ........................................ 18
8.1.1.5 setvar() ........................................ 19
8.1.1.6 searchcolumn() .................................. 20
8.1.1.7 setRowStatus() .................................. 20
8.1.2 General SNMP Functions ............................ 21
8.1.2.1 writeVarbind() .................................. 22
8.1.2.2 readVarbind() ................................... 23
8.1.2.3 snmpsend() ...................................... 24
8.2 Constants ........................................... 24
8.3 Policy Configuration Access Functions ............... 26
8.3.1 roleMatch() ....................................... 26
8.3.2 capMatch() ........................................ 26
8.3.3 elementName() ..................................... 26
8.3.4 setScratchpad() ................................... 27
8.3.5 getScratchpad() ................................... 27
8.4 Utility Accessor Functions .......................... 27
8.4.1 oidlength() ....................................... 28
8.4.2 oidncmp() ......................................... 28
8.4.3 subid() ........................................... 28
8.4.4 oidsplice() ....................................... 28
8.5 Library Accessor Functions .......................... 29
9 Definitions ........................................... 30
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10 Security Considerations .............................. 51
11 References ........................................... 52
12 Intellectual Property ................................ 53
13 Full Copyright Statement ............................. 54
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