One document matched: draft-ietf-ccamp-lmp-behavior-negotiation-01.txt
Differences from draft-ietf-ccamp-lmp-behavior-negotiation-00.txt
Network Working Group Dan Li
Internet Draft Huawei
Updates: RFC4204 D. Ceccarelli
Category: Standards Track Ericsson
Expires: April 2011 October 11, 2010
Behavior Negotiation in The Link Management Protocol
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79.
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
This Internet-Draft will expire on April 11, 2011.
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in
Li. et al. Expires April 2011 [Page 1]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License.
Abstract
The Link Management Protocol (LMP) is used to coordinate the
properties, use, and faults of data links in Generalized
Multiprotocol Label Switching (GMPLS) networks. Various proposals
have been advanced to provide extensions to the base LMP
specification. This document defines an extension to negotiated
capabilities and provides a generic procedure for LMP
implementations that do not recognize or do not support any one of
these extensions.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Table of Contents
1. Introduction ................................................. 2
2. LMP Behavior Negotiation Procedure ........................... 3
3. Backwards Compatibility ...................................... 5
4. Security Considerations ...................................... 5
5. IANA Considerations .......................................... 6
5.1. New LMP Class Type ...................................... 6
5.2. New Capabilities Registry ............................... 6
6. Contributors ................................................. 7
7. Acknowledgments .............................................. 7
8. References ................................................... 7
8.1. Normative References .................................... 7
8.2. Informative References .................................. 8
9. Authors' Addresses ........................................... 8
1. Introduction
The Link Management Protocol (LMP) [RFC4204] is being successfully
deployed in Generalized Multiprotocol Label Switching (GMPLS)-
controlled networks. New LMP behaviors and protocol extensions are
being introduced in a number of IETF documents.
In the network, if one GMPLS Label Switch Router (LSR) supports a
new behavior or protocol extension, but its peer LSR does not, it is
necessary to have a protocol mechanism for resolving issues that may
Li. et al. Expires April 2011 [Page 2]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
arise. It is also beneficial to have a protocol mechanism to
discover the capabilities of peer LSRs. There is no such procedure
defined in the base LMP specification [RFC4204], so this document
defines how to handle LMP extensions both at legacy LSRs and at
upgraded LSRs that would communicate with legacy LSRs.
In [RFC4204], the basic behaviors have been defined around the use
of the standard LMP messages, which include Config, Hello, Verify,
Test, LinkSummary, and ChannelStatus. Per [RCF4204], these behaviors
MUST be supported when LMP is implemented, and the message types
from 1 to 20 have been assigned by IANA for these messages.
In [RFC4207], the SONET/SDH technology-specific behavior and
information for LMP is defined. The TRACE behavior is added to LMP,
and the message types from 21 to 31 were assigned by IANA for the
messages that provide the TRACE function. The TRACE function has
been extended for the support of OTNs (Optical Transport Networks)
in [LMP TEST].
In [RFC4209], extensions to LMP are defined to allow it to be used
between a peer node and an adjacent Optical Line System (OLS). The
LMP object class type and sub-object class name have been extended
to support DWDM behavior.
In [RFC5818], the data channel consistency check behavior is defined,
and the message types from 32 to 34 have been assigned by IANA for
messages that provide this behavior.
It is likely that future extensions to LMP for other functions or
technologies will require the definition of further LMP messages.
This document describes the behavior negotiation procedure to make
sure both LSRs at the ends of each link understand the LMP messages
that they exchange.
2. LMP Behavior Negotiation Procedure
The Config message is used in the control channel negotiation phase
of LMP [RC4204]. The LMP behavior negotiation procedure is defined
in this document as an addition to this phase.
The Config message is defined in Section 12.3.1 of [RFC4204] and
carries the <CONFIG> object (class name 6) as defined in Section
13.6 of [RFC4204].
Li. et al. Expires April 2011 [Page 3]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
Two class types have been defined:
- C-Type = 1, HelloConfig, defined in [RFC4204]
- C-Type = 2, LMP_WDM_CONFIG, defined in [RFC4209]
This document defines a third C-Type with value 3 (TBD by IANA) to
report and negotiate currently defined LMP mechanisms and behaviors,
and to allow future LMP extensions to be reported and negotiated.
- C-Type = 3, BEHAVIOR_CONFIG
The format of the new type of CONFIG Class is defined as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length |B|S|D|C|O| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Length: 8 bits
This field indicates the total length of the objects expressed in
multiples of 4 bytes.
Flags:
B: 1 bit
This bit indicates support for the basic behaviors defined in
[RFC4204].
S: 1 bit
This bit indicates support for the Trace behavior of SONET/SDH
technology-specific defined in [RFC4207].
D: 1 bit
This bit indicates support for the DWDM behavior defined in
[RFC4209].
C: 1 bit
This bit indicates support for the data channel consistency check
behavior defined in [RFC5818].
Li. et al. Expires April 2011 [Page 4]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
O: 1 bit
This bit indicates support for the TEST behavior of OTN
technology-specific defined in [LMP TEST].
Further bits may be defined in future documents.
The Reserved field MUST be sent as zero and MUST NOT be ignored on
receipt. This allows the detection of unsupported or unknown LMP
behaviors when new bits are allocated to indicate further
capabilities and are sent as one.
Upon receiving a bit set related to an unsupported or unknown
behavior, a ConfigNack message MUST be sent with a <CONFIG> object,
the BEHAVIOR_CONFIG C-Type representing the supported LMP behaviors.
An LSR receiving such a ConfigNack SHOULD select a supported set of
capabilities and send a further Config message, or MAY raise an
alert to the management system (or log an error) and stop trying to
perform LMP communications with its neighbor.
3. Backwards Compatibility
An LSR that receives a Config message containing a <CONFIG> object
with a C-Type that it does not recognize MUST respond with a
ConfigNack message as described in [RFC4204]. Thus, legacy LMP nodes
that do not support the BEHAVIOR_CONFIG C-Type defined in this
document will respond with a ConfigNack message.
It's not explicitly stated in [RFC4204] that a Config Message could
include multiple <CONFIG> objects. But with new CONFIG C-Types are
defined, multiple <CONFIG> objects (each with a different Class Type)
MAY be present on a Config message in which case all of the objects
MUST be processed.
4. Security Considerations
[RFC4204] describes how LMP messages between peers can be secured,
and these measures are equally applicable to messages carrying the
new <CONFIG> object defined in this document.
The operation of the procedures described in this document does not
of itself constitute a security risk since they do not cause any
change in network state. It would be possible, if the messages were
Li. et al. Expires April 2011 [Page 5]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
intercepted or spoofed to cause bogus alerts in the management plane,
or to cause LMP peers to consider that they could or could not
operate protocol extensions, and so the use of the LMP security
measures are RECOMMENDED.
5. IANA Considerations
5.1. New LMP Class Type
IANA maintains the "Link Management Protocol (LMP)" registry which
has a subregistry called "LMP Object Class name space and Class type
(C-Type)".
IANA is requested to make an assignment from this registry as
follows:
6 CONFIG [RFC4204]
CONFIG Object Class type name space:
C-Type Description Reference
------ ------------------------ ---------
3 BEHAVIOR_CONFIG [This.I-D]
5.2. New Capabilities Registry
IANA is requested to create a new subregistry of the "Link
Management Protocol (LMP)" registry to track the Behaviour
Configuration bits defined in Section 2 of this document. It is
suggested that this registry be called "LMP Behaviour Configuration
Flags".
Allocations from this registry are by Standards Action.
Bits in this registry are numbered from zero as the most significant
bit (transmitted first). The number of bits that can be present is
limited by the length field of the <CONFIG> object which gives rise
to (255 x 32)-8 = 8152. IANA is strongly recommended to allocate new
bits with the lowest available unused number.
The registry is initially populated as follows:
Li. et al. Expires April 2011 [Page 6]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
Bit | Bit | Meaning | Reference
Number | Name | |
-------+------+----------------------------------------+----------
0 | B | Basic LMP behavior support | [This.ID]
1 | S | SONET/SDH Test support | [This.ID]
2 | D | DWDM support | [This.ID]
3 | C | Data Channel consistency check support | [This.ID]
4 | O | OTN TEST behavior | [This.ID]
6. Contributors
Diego Caviglia
Ericsson
Via A. Negrone 1/A 16153
Genoa Italy
Phone: +39 010 600 3736
Email: diego.caviglia@ericsson.com
7. Acknowledgments
Thanks to Adrian Farrel and Lou Berger for their useful comments.
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4204] J. Lang, Ed., "Link Management Protocol (LMP)", RFC 4204,
October 2005.
[RFC4207] J. Lang, Ed., "Synchronous Optical Network (SONET)/
Synchronous Digital Hierarchy (SDH) Encoding for Link
Management Protocol (LMP) Test Messages", RFC 4207,
October 2005.
[RFC4209] A. Fredette, Ed., "Link Management Protocol (LMP) for
Dense Wavelength Division Multiplexing (DWDM) Optical Line
Systems", RFC 4209, October 2005.
[RFC5818] D. Li, Ed., "Data Channel Status Confirmation Extensions
for the Link Management Protocol", RFC 5818, April 2010.
Li. et al. Expires April 2011 [Page 7]
draft-ietf-ccamp-lmp-behavior-negotiation-01.txt October 2010
8.2. Informative References
[LMP TEST] D. Ceccarelli, Ed., "Link Management Protocol (LMP) Test
Messages Extensions for Evolutive Optical Transport
Networks (OTN)" draft-ceccarelli-ccamp-gmpls-g709-lmp-
test-02.txt, May, 2010.
9. Authors' Addresses
Dan Li
Huawei Technologies
F3-5-B R&D Center, Huawei Industrial Base,
Shenzhen 518129 China
Phone: +86 755-289-70230
Email: danli@huawei.com
Daniele Ceccarelli
Ericsson
Via A. Negrone 1/A
Genova - Sestri Ponente
Italy
Email: daniele.ceccarelli@ericsson.com
Li. et al. Expires April 2011 [Page 8]
| PAFTECH AB 2003-2026 | 2026-04-23 01:24:24 |