One document matched: draft-ietf-ccamp-rsvp-te-mpls-tp-oam-ext-04.xml
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<rfc category="std" docName="draft-ietf-ccamp-rsvp-te-mpls-tp-oam-ext-04"
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<front>
<!-- The abbreviated title is used in the page header - it is only necessary if the
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<title abbrev="Extensions for MPLS-TP OAM Conf">Configuration of pro-active MPLS-TP Operations, Administration, and Maintenance (OAM) Functions Using RSVP-TE</title>
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<author fullname="Elisa Bellagamba" initials="E." role="editor"
surname="Bellagamba">
<organization>Ericsson</organization>
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<street>Farogatan 6</street>
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<city>Kista</city>
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<code>164 40</code>
<country>Sweden</country>
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<email>elisa.bellagamba@ericsson.com</email>
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<author fullname="Loa Andersson" initials="L." role="editor"
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<email>loa.andersson@ericsson.com</email>
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<author fullname="Pontus Skoldstrom" initials="P." role="editor"
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<organization>Acreo AB</organization>
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<email>pontus.skoldstrom@acreo.se</email>
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<author fullname="Attila Takacs" initials="A." role=""
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<street>1. Laborc u.
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<date day="9" month="January" year="2011" />
<area>Signaling</area>
<workgroup>CCAMP Working Group</workgroup>
<keyword>RSVP-TE</keyword>
<keyword>GMPLS</keyword>
<keyword>MPLS</keyword>
<keyword>MPLS-TP</keyword>
<abstract>
<t>This specification describes the configuration of pro-active MPLS-TP Operations,
Administration, and Maintenance (OAM) Functions for a given LSP using a common set
of TLVs that can be carried on RSVP-TE protocol.</t>
</abstract>
</front>
<middle>
<section title="Introduction">
<t>This document describes the configuration of pro-active MPLS-TP Operations,
Administration, and Maintenance (OAM) Functions for a given LSP using a common
set of TLVs carried on RSVP-TE [RFC3209] but reusable also for LSP Ping [BFD-Ping] as defined in [LSP-PING CONF].
In particular it specifies the mechanisms necessary to establish MPLS-TP OAM
entities monitoring an LSP and defines information elements and procedures to
configure pro-active MPLS OAM functions. Initialization and control of on-demand
MPLS OAM functions are expected to be carried out by directly accessing network nodes
via a management interface; hence configuration and control of on-demand OAM functions
are out-of-scope for this document.</t>
<t>Pro-active MPLS OAM is based on the Bidirectional Forwarding
Detection (BFD) protocol [RFC5880]. Bidirectional Forwarding Detection
(BFD), as described in [RFC5880], defines a protocol that provides low-
overhead, short-duration detection of failures in the path between
two forwarding engines, including the interfaces, data link(s), and
to the extent possible the forwarding engines themselves. BFD can be
used to track the liveliness and detect data plane failures of MPLS-TP point-to-point
and might also be extended to p2mp connections.</t>
<t>MPLS Transport Profile (MPLS-TP) describes a profile of MPLS that
enables operational models typical in transport networks, while
providing additional OAM, survivability and other maintenance
functions not currently supported by MPLS. [RFC5860] defines the requirements
for the OAM functionality of MPLS-TP.</t>
<t>BFD has been chosen to be the basis of pro-active MPLS-TP OAM functions.
MPLS-TP OAM extensions for transport applications, for which this document specifies
the configuration, are specified in [BFD-CCCV], [MPLS-PM], and [MPLS-FMS].</t>
<section title="Contributing Authors">
<t>This document is the result of a large team of authors and contributors. The following is a list of the co-authors:</t>
<t>
<list>
<t>John Drake</t>
<t>Benoit Tremblay</t>
</list>
</t>
</section>
<section title ="Requirements Language">
<t>
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 <xref
target="RFC2119">RFC 2119</xref>.
</t>
</section>
<section title="Overview of BFD OAM operation">
<t>BFD is a simple hello protocol that in many respects is similar to
the detection components of well-known routing protocols. A pair of systems transmits BFD packets periodically over each path between the
two systems, and if a system stops receiving BFD packets for long
enough, some component in that particular bidirectional path to the
neighboring system is assumed to have failed. Systems may also
negotiate to not send periodic BFD packets in order to reduce
overhead.</t>
<t>A path is only declared to be operational when two-way communication
has been established between systems, though this does not preclude
the use of unidirectional links to support bidirectional paths
(co-routed or bidirectional or associated bidirectional).</t>
<t>Each system estimates how quickly it can send and receive BFD packets
in order to come to an agreement with its neighbor about how rapidly
detection of failure will take place. These estimates can be
modified in real time in order to adapt to unusual situations. This
design also allows for fast systems on a shared medium with a slow
system to be able to more rapidly detect failures between the fast
systems while allowing the slow system to participate to the best of
its ability.</t>
<t>The ability of each system to control the BFD packet transmission
rate in both directions provides a mechanism for congestion control,
particularly when BFD is used across multiple network hops.</t>
<t>As recommended in [BFD-CCCV], the BFD tool needs to be extended for the
proactive CV functionality by the addition of an unique identifier in order to meet the requirements. The document in [BFD-CCCV] specifies the BFD
extension and behavior to meet the requirements for MPLS-TP proactive
Continuity Check and Connectivity Verification functionality and the
RDI functionality as defined in [RFC5860].</t>
</section>
</section>
<section title="Overview of MPLS OAM for Transport Applications">
<t>[MPLS-TP-OAM-FWK] describes how MPLS OAM mechanisms are operated
to meet transport requirements outlined in [RFC5860].</t>
<t>[BFD-CCCV] specifies two BFD operation modes: 1) "CC mode",
which uses periodic BFD message exchanges with symmetric timer settings,
supporting Continuity Check, 2) "CV/CC mode" which sends unique
maintenance entity identifiers in the periodic BFD messages supporting
Connectivity Verification as well as Continuity Check.</t>
<t>[MPLS-PM] specifies mechanisms for performance monitoring of LSPs,
in particular it specifies loss and delay measurement OAM functions.</t>
<t>[MPLS-FMS] specifies fault management signals with which a server
LSP can notify client LSPs about various fault conditions to suppress
alarms or to be used as triggers for actions in the client LSPs.
The following signals are defined: Alarm Indication Signal (AIS),
Link Down Indication (LDI) and Locked Report (LKR). To indicate client
faults associated with the attachment circuits Client Signal Failure
Indication (CSF) can be used. CSF is described in [MPLS-TP-OAM-FWK]
and in the context of this document is for further study.</t>
<t>[MPLS-TP-OAM-FWK] describes the mapping of fault conditions to
consequent actions. Some of these mappings may be configured by the
operator, depending on the application of the LSP. The following defects
are identified: Loss Of Continuity (LOC), Misconnectivity,
MEP Misconfiguration and Period Misconfiguration. Out of these defect
conditions, the following consequent actions may be configurable:
1) whether or not the LOC defect should result in blocking the outgoing
data traffic; 2) whether or not the "Period Misconfiguration defect"
should result a signal fail condition.</t>
</section>
<section title="Theory of Operations">
<section title="MPLS OAM Configuration Operation Overview">
<t>RSVP-TE, or in alternative LSP Ping [LSP-PING CONF], can be used to simply establish (i.e., bootstrap) a BFD session
or it can selectively enable and configure all pro-active MPLS OAM functions.
For this specification, BFD MUST be run in asynchronous mode and both sides should
be in active mode.</t>
<t>In the simplest scenario RSVP-TE, or in alternative LSP Ping [LSP-PING CONF], is used only to bootstrap the BFD session.
In this case the initiating node includes an 'OAM Configuration TLV' in the message it
sends to the receiving node at the other end of the LSP. The OAM Type in the
'OAM Configuration TLV' is set to 'MPLS OAM', the CC OAM Function flag is set,
and a 'BFD Configuration sub-TLV' is included. The sub-TLV carries a 'Local Discriminator
sub-TLV' with the discriminator value selected by the initiating node for the BFD session
associated with the LSP. The N flag in the 'BFD Configuration sub-TLV' MUST be set to enable
timer negotiation/re-negotiation via BFD Control Messages.</t>
<t>The receiving node MUST use the Local Discriminator value it receives to
identify the remote end of the BFD session. The receiving node must send a
message to the initiating node that includes an 'OAM Configuration TLV' containing
the same values as it received, except for the 'Local Discriminator sub-TLV', which
contains the local discriminator value selected by the receiving node for the BFD session.</t>
<t>Timer negotiation is performed in subsequent BFD control messages.
This operation is similar to LSP Ping based bootstrapping described in [RFC5884].</t>
<t>If timer negotiation is to be done using the TLVs defined in this document rather
than with BFD Control Messages, the N flag MUST be cleared and a 'Timer Negotiation
Parameters sub-TLV' MUST be present in the 'BFD Configuration sub-TLV'.
In this case, there are two configuration options, symmetric and asymmetric.
If symmetric configuration is used, the S flag in 'BFD Configuration sub-TLV' MUST be set.
If the flag is cleared, the configuration is completed asymmetrically in the two directions.
Section 3.3.2 includes a detailed explanation of such configuration.</t>
<t>In the case of the "CV/CC mode" OAM [BFD-CCCV], the "CV" flag MUST be set in
addition to the CC flag in the "OAM Configuration TLV". The information required
to support this functionality is defined in [MPLS-TP-IDENTIF]. If RSVP-TE is used,
this information is found respectively in the SESSION and SENDER_TEMPLATE object with
no need of further sub-TLV as described in section 3.2. In case of LSP Ping configuration this information is supplied by an additional sub-TLV, but this is defined in [LSP-PING CONF] and it is outside the scope of this document.</t>
</section>
<section title="OAM Configuration TLV">
<t>The "OAM Configuration TLV" is depicted in the following figure.
It specifies the OAM functions that are to be used for the subject LSP and it is defined in
[OAM-CONF-FWK]. For RSVP-TE, the "OAM Configuration TLV" is carried in the LSP_ATTRIBUTES
object in Path and Resv messages.</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (2) (IANA) | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OAM Type | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ sub-TLVs ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates the "OAM Configuration TLV" (2) (IANA to assign).</t>
<t>OAM Type: one octet that specifies the technology specific OAM Type.
If the requested OAM Type is not supported, an error must be
generated: "OAM Problem/Unsupported OAM Type".</t>
<t>This document defines a new OAM Type: "MPLS OAM" (suggested value 2, IANA to assign)
from the "RSVP-TE OAM Configuration Registry". The "MPLS OAM" type is set to request
the establishment of OAM functions for MPLS-TP LSPs. The specific OAM functions are
specified in the "Function Flags" sub-TLV as depicted in [OAM-CONF-FWK].</t>
<t>The receiving edge LSR when the MPLS-TP OAM Type is requested should check
which OAM Function Flags are set in the "Function Flags TLV" and look
for the corresponding technology specific configuration TLV.</t>
<t>Additional corresponding sub-TLVs are as follows:</t>
<t><list>
<t>- "BFD Configuration sub-TLV", which MUST be included if the
CC OAM Function flag is set. This sub-TLV MUST carry a
"BFD Local Discriminator sub-TLV" and a "Timer Negotiation
Parameters sub-TLV" if the N flag is cleared.</t>
<t>- "MPLS OAM PM Loss sub-TLV", which MAY be included if
the PM/Loss OAM Function flag is set. If the "MPLS OAM PM
Loss sub-TLV" is not included, default configuration values
are used.</t>
<t>- "MPLS OAM PM Delay sub-TLV", which MAY be included
if the PM/Delay OAM Function flag is set. If the "MPLS
OAM PM Delay sub-TLV" is not included, default configuration
values are used.</t>
<t>- "MPLS OAM FMS sub-TLV", which MAY be included if the FMS
OAM Function flag is set. If the "MPLS OAM FMS sub-TLV"
is not included, default configuration values are used.</t>
<t>- Moreover, 'Unique MEP-ID of Source', MUST be included in case the configuration is done with LSP Ping and CV flag is set as defined in [LSP-PING CONF]. But this is outside the scope of this document.</t>
</list></t>
<t>Moreover, if the CV flag is set, the CC flag MUST be set at the
same time. The format of an MPLS-TP CV/CC message is shown in
[BFD-CCCV] and it requires, together with the BFD control packet
information, the "Unique MEP-ID of source of BFD packet".
[MPLS-TP-IDENTIF] defines the composition of such identifier as:</t>
<t><"Unique MEP-ID of source of BFD packet"> ::= <src_node_id><src_tunnel_num><lsp_num></t>
<!--
<t>
<figure>
<artwork><![CDATA[
<"Unique MEP-ID of source of BFD packet"> ::= <src_node_id><src_tunnel_num><lsp_num>
]]></artwork>
</figure>
</t>
-->
<t>GMPLS signaling [RFC3473] uses a 5-tuple to uniquely identify an
LSP within an operator's network. This tuple is composed of a Tunnel
Endpoint Address, Tunnel_ID, Extended Tunnel ID, and Tunnel Sender
Address and (GMPLS) LSP_ID.</t>
<t>Hence, the following mapping is used without the need of redefining
a new TLV for MPLS-TP proactive CV purpose.</t>
<t>
<list>
<t>- Tunnel ID = src_tunnel_num</t>
<t>- Tunnel Sender Address = src_node_id</t>
<t>- LSP ID = LSP_Num</t>
</list>
</t>
<t>"Tunnel ID" and "Tunnel Sender Address" are included in
the "SESSION" object [RFC3209], which is mandatory in both Path
and Resv messages.</t>
<t>"LSP ID" will be the same on both directions and it is
included in the "SENDER_TEMPLATE" object [RFC3209] which
is mandatory in Path messages.</t>
<t>In case the configuration is done via LSP Ping [LSP-PING CONF] the 'Unique MEP-ID of Source' is needed to supply this information but this is defined in [LSP-PING CONF] and it is outside the scope of this document.</t>
<t>[Author's note: the same "Unique MEP-ID of source"
will be likely required for Performance monitoring purposes.
However for the moment in [MPLS-PM] it is stated: "The question
of ACH TLV usage and the manner of supporting metadata such as authentication
keys and node identifiers is deliberately omitted. These issues will be addressed
in a future version of the document."]</t>
</section>
<section title="BFD Configuration TLV">
<t>The "BFD Configuration TLV" (depicted below) is defined for BFD OAM
specific configuration parameters. The "BFD Configuration TLV" is
carried as a sub-TLV of the "OAM Configuration TLV".</t>
<t>This new TLV accommodates generic BFD OAM information and carries
sub-TLVs.</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (3) (IANA) | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Vers.| PHB |N|S| Reserved (set to all 0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ sub TLVs ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the "BFD
Configuration TLV" (IANA to define).</t>
<t>Length: indicates the total length including sub-TLVs.</t>
<t>Version: identifies the BFD protocol version. If a node does not
support a specific BFD version an error must be generated:
"OAM Problem/Unsupported OAM Version &rdquo".</t>
<t>PHB: Identifies the Per-Hop Behavior (PHB) to be used for
periodic continuity monitoring messages.</t>
<t>BFD Negotiation (N): If set timer negotiation/re-negotiation
via BFD Control Messages is enabled, when cleared it is disabled.</t>
<t>The "BFD Configuration TLV" MUST include the following sub-TLVs
in the Path message:</t>
<t><list>
<t>- "Local Discriminator sub-TLV";</t>
<t>- "Negotiation Timer Parameters sub-TLV" if N flag is cleared.</t>
</list></t>
<t>The "BFD Configuration TLV" MUST include the following
sub-TLVs in the Resv message:</t>
<t><list>
<t>- "Local Discriminator sub-TLV;"</t>
<t>- "Negotiation Timer Parameters sub-TLV" if:
<list>
<t>- N flag and S are cleared </t>
<t>- N flag is cleared and S flag is set and a timing value
higher than the one received needs to be used</t>
</list>
</t>
</list></t>
<section title="Local Discriminator sub-TLV">
<t>The "Local Discriminator sub-TLV" is carried as a sub-TLV of the BFD
Configuration sub-TLV. It is depicted below.</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (1) (IANA) | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Local Discriminator |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the Local Discriminator sub TLV (1)
(IANA to define).</t>
<t>Length: indicates the TLV total length in octets.</t>
<t>Local Discriminator: A unique, nonzero discriminator value generated
by the transmitting system and referring to itself, used to
demultiplex multiple BFD sessions between the same pair of systems.</t>
</section>
<section title="Negotiation Timer Parameters">
<t>The "Negotiation Timer Parameters sub-TLV" is depicted below.</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Req. TX int. Type (2) (IANA) | Length = 20 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Acceptable Min. Asynchronous TX interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Acceptable Min. Asynchronous RX interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Required Echo TX Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Detect. Mult.| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the "Negotiation Timer Parameters
sub-TLV" (IANA to define).</t>
<t>Length: indicates the TLV total length in octets.</t>
<t>Acceptable Min. Asynchronous TX interval: in case of S
(symmetric) flag set in the "BFD Configuration" TLV,
it expresses the desired time interval (in microseconds) at
which the LER initiating the signaling intends to both transmit
and receive BFD periodic control packets. If the receiving edge LSR can
not support such value, it is allowed to reply back with an interval
greater than the one proposed.</t>
<t>In case of S (symmetric) flag cleared in the "BFD
Configuration TLV", this field expresses the desired
time interval (in microseconds) at which a edge LSR intends to
transmit BFD periodic control packets in its transmitting direction.</t>
<t>Acceptable Min. Asynchronous RX interval: in case of S
(symmetric) flag set in the "BFD Configuration TLV", this
field MUST be equal to "Acceptable Min. Asynchronous TX interval"
and has no additional meaning respect to the one described for
"Acceptable Min. Asynchronous TX interval".</t>
<t>In case of S (symmetric) flag cleared in the "BFD Configuration
TLV", it expresses the minimum time interval (in microseconds)
at which edge LSRs can receive BFD periodic control packets. In case
this value is greater than the "Acceptable Min. Asynchronous TX
interval" received from the other edge LSR, such edge LSR MUST adopt the
interval expressed in this "Acceptable Min. Asynchronous RX interval".</t>
<t>Required Echo TX Interval: the minimum interval, in microseconds,
between received BFD Echo packets that this system is capable of
supporting, less any jitter applied by the sender as described in
[RFC5880] sect. 6.8.9. This value is also an indication for the
receiving system of the minimum interval between transmitted BFD Echo
packets. If this value is zero, the transmitting system does not
support the receipt of BFD Echo packets. If the receiving system can
not support this value an error MUST be generated "Unsupported BFD TX
rate interval".</t>
<t>Detection time multiplier: The negotiated transmit interval,
multiplied by this value, provides the Detection Time for the
receiving system in Asynchronous mode.</t>
</section>
</section>
<section title="MPLS OAM PM Loss TLV">
<t>The "MPLS OAM PM Loss TLV" depicted below is carried
as a sub-TLV of the "OAM Configuration TLV".</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PM Loss Type (3) (IANA) | Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Vers.|E|C| | Reserved | PHB |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Measurement Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Loss Threshold |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the "PM Loss" (IANA to define).</t>
<t>Length: indicates the TLV total length in octets.</t>
<t>Version: indicates the Loss measurement protocol version.</t>
<t>Configuration Flags:
<list>
<t>- E: exclude from the Loss Measurement all G-ACh messages</t>
<t>- C: require the use of a counter in the "Querier Context"
field described in [MPLS-PM]</t>
<t>- Remaining bits: Reserved for future specification and set to 0.</t>
</list>
</t>
<t>PHB: identifies the per-hop behavior of packets with
loss information.</t>
<t>Measurement Interval: the time interval (in microseconds)
at which Loss Measurement query messages MUST be sent on both
directions. If the edge LSR receiving the Path message can not support
such value, it can reply back with a higher interval.</t>
<t>Loss Threshold: the threshold value of lost packets over
which protections MUST be triggered.</t>
</section>
<section title="MPLS OAM PM Delay TLV">
<t>The "MPLS OAM PM Delay TLV" depicted below is
carried as a sub-TLV of the "OAM Configuration TLV".</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PM Delay Type (4) (IANA) | Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Vers.| Flags | Reserved | PHB |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Measurement Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Delay Threshold |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the "PM Delay" (IANA to define).</t>
<t>Length: indicates the TLV total length in octets.</t>
<t>Version: indicates the Delay measurement protocol version.</t>
<t>Configuration Flags:
<list>
<t>- E: exclude from the Loss Measurement all G-ACh messages</t>
<t>- C: require the use of a counter in the "Querier Context" field
described in [MPLS-PM]</t>
<t>- Remaining bits: Reserved for future specification and set to 0.</t>
</list>
</t>
<t>PHB: - identifies the per-hop behavior of packets with delay
information.</t>
<t>Measurement Interval: the time interval (in microseconds)
at which Delay Measurement query messages MUST be sent on both
directions. If the edge LSR receiving the Path message can not support
such value, it can reply back with a higher interval.</t>
<t>Delay Threshold: the threshold value of lost packets over which
protections MUST be triggered.</t>
<t>[Author's note: TBD if we want to include the timestamp
format negotiation as in [MPLS-PM] 4.2.5.]</t>
</section>
<section title="MPLS OAM FMS TLV">
<t>The "MPLS OAM FMS TLV" depicted below is carried as a sub-TLV of the
"OAM Configuration TLV".</t>
<t>
<figure>
<artwork><![CDATA[
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (5) (IANA) | Length (12) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|D|L|C| Reserved | |E| PHB |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Refresh Timer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>
</t>
<t>Type: indicates a new type, the "PM Delay" (IANA to define).</t>
<t>Length: indicates the TLV total length in octets.</t>
<t>Signal Flags: are used to enable the following signals:
<list>
<t>- A: Alarm Indication Signal (AIS) as described in [MPLS-FMS]</t>
<t>- D: Link Down Indication (LDI) as described in [MPLS-FMS]</t>
<t>- L: Locked Report (LKR) as described in [MPLS-FMS]</t>
<t>- C: Client Signal Failure (CSF) as described in [MPLS-CSF]</t>
</list>
</t>
<t>Configuration Flags:
<list>
<t>- E: used to enable/disable explicitly clearing faults</t>
<t>- PHB: identifies the per-hop behavior of packets with fault
management information</t>
</list>
</t>
<t>Refresh Timer: indicates the refresh timer (in microseconds)
of fault indication messages. If the edge LSR receiving the Path message
can not support such value, it can reply back with a higher interval.</t>
</section>
</section>
<!-- Possibly a 'Contributors' section ... -->
<section anchor="IANA" title="IANA Considerations">
<t>This document specifies the following new TLV types:</t>
<t><list>
<t>- "BFD Configuration" type: 2;</t>
<t>- "MPLS OAM PM Loss" type: 3;</t>
<t>- "MPLS OAM PM Delay" type: 4;</t>
<t>- "MPLS OAM PM FMS" type: 5.</t>
</list> </t>
<t>sub-TLV types to be carried in the "BFD Configuration sub-TLV":
<list>
<t>- "Local Discriminator" sub-TLV type: 1;</t>
<t>- "Negotiation Timer Parameters" sub-TLV type: 2.</t>
</list>
</t>
</section>
<section title="BFD OAM configuration errors">
<t>In addition to error values specified in [OAM-CONF-FWK] and [ETH-OAM]
this document defines the following values for the "OAM Problem" Error Code:</t>
<t><list>
<t>- "MPLS OAM Unsupported Functionality";</t>
<t>- "OAM Problem/Unsupported TX rate interval".</t>
</list>
</t>
</section>
<section title="Acknowledgements">
<t>The authors would like to thank David Allan,
Lou Berger, Annamaria Fulignoli, Eric Gray, Andras Kern, David Jocha and David Sinicrope
for their useful comments.</t>
</section>
<section anchor="Security" title="Security Considerations">
<t>The signaling of OAM related parameters and the automatic establishment of OAM
entities introduces additional security
considerations to those discussed in [RFC3473]. In particular, a
network element could be overloaded, if an attacker would request
liveliness monitoring, with frequent periodic messages, for a high
number of LSPs, targeting a single network element.</t>
<t>Security aspects will be covered in more detailed in subsequent
versions of this document.</t>
</section>
</middle>
<!-- *****BACK MATTER ***** -->
<back>
<!-- References split into informative and normative -->
<!-- There are 2 ways to insert reference entries from the citation libraries:
1. define an ENTITY at the top, and use "ampersand character"RFC2629; here (as shown)
2. simply use a PI "less than character"?rfc include="reference.RFC.2119.xml"?> here
(for I-Ds: include="reference.I-D.narten-iana-considerations-rfc2434bis.xml")
Both are cited textually in the same manner: by using xref elements.
If you use the PI option, xml2rfc will, by default, try to find included files in the same
directory as the including file. You can also define the XML_LIBRARY environment variable
with a value containing a set of directories to search. These can be either in the local
filing system or remote ones accessed by http (http://domain/dir/... ).-->
<references title="Normative References">
<!--?rfc include="http://xml.resource.org/public/rfc/bibxml/reference.RFC.2119.xml"?-->
<?rfc include="reference.RFC.3471"?>
<?rfc include="reference.RFC.2119"?>
<?rfc include="reference.RFC.5586"?>
<?rfc include="reference.RFC.5654"?>
<?rfc include="reference.RFC.5880"?>
<?rfc include="reference.RFC.3209"?>
<?rfc include="reference.RFC.3473"?>
<?rfc include="reference.RFC.5884"?>
<?rfc include="reference.RFC.5860"?>
<reference anchor="OAM-CONF-FWK"
target="draft-ietf-ccamp-oam-configuration-fwk">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>OAM Configuration Framework for GMPLS RSVP-TE</title>
<author initials="A" surname="Takacs">
<organization></organization>
</author>
<author initials="D" surname="Fedyk">
<organization></organization>
</author>
<author initials="J" surname="van He">
<organization></organization>
</author>
<date year="2009" />
</front>
</reference>
<reference anchor="MPLS-TP-IDENTIF"
target="draft-ietf-mpls-tp-identifiers">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>MPLS-TP Identifiers</title>
<author initials="M" surname="Bocci">
<organization></organization>
</author>
<author initials="G" surname="Swallow">
<organization></organization>
</author>
<author initials="E" surname="Gray">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="MPLS-PM"
target="draft-ietf-mpls-tp-loss-delay">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Packet Loss and Delay Measurement for the MPLS Transport Profile</title>
<author initials="S" surname="Bryant">
<organization></organization>
</author>
<author initials="D" surname="Frost">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="MPLS-PM-Profile"
target="draft-ietf-mpls-tp-loss-delay-profile">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>A Packet Loss and Delay Measurement Profile for MPLS-based Transport Networks</title>
<author initials="S" surname="Bryant">
<organization></organization>
</author>
<author initials="D" surname="Frost">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="MPLS-FMS"
target="draft-ietf-mpls-tp-fault">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>MPLS Fault Management OAM</title>
<author initials="G" surname="Swallow">
<organization></organization>
</author>
<author initials="A" surname="Fulignoli">
<organization></organization>
</author>
<author initials="M" surname="Vigoureux">
<organization></organization>
</author>
<author initials="S" surname="Boutros">
<organization></organization>
</author>
<author initials="D" surname="Ward">
<organization></organization>
</author>
<date year="2009" />
</front>
</reference>
<reference anchor="MPLS-CSF"
target="draft-he-mpls-tp-csf">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Indication of Client Failure in MPLS-TP</title>
<author initials="J" surname="He">
<organization></organization>
</author>
<author initials="H" surname="Li">
<organization></organization>
</author>
<author initials="E" surname="Bellagamba">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
</references>
<references title="Informative References">
<reference anchor="LSP-PING CONF"
target="draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Configuration of pro-active MPLS-TP Operations, Administration, and Maintenance (OAM) Functions Using LSP Ping</title>
<author initials="E" surname="Bellagamba">
<organization>Ericsson</organization>
</author>
<author initials="L" surname="Andersson">
<organization>Ericsson</organization>
</author>
<author initials="D" surname="Ward">
<organization>Cisco</organization>
</author>
<author initials="P" surname="Skölström">
<organization>Acreo</organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="BFD-CCCV"
target="draft-ietf-mpls-tp-bfd-cc-cv-rdi">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Proactive Connectivity Verification, Continuity Check and Remote Defect indication for MPLS Transport Profile</title>
<author initials="D" surname="Allan">
<organization></organization>
</author>
<author initials="G" surname="Swallow">
<organization></organization>
</author>
<author initials="J" surname="Drake">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="BFD-Ping"
target="draft-ietf-mpls-tp-lsp-ping-bfd-procedures-02">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>LSP-Ping and BFD encapsulation over ACH</title>
<author initials="N" surname="Bahadur">
<organization></organization>
</author>
<author initials="R" surname="Aggarwal">
<organization></organization>
</author>
<author initials="D" surname="Ward">
<organization></organization>
</author>
<author initials="T" surname="Nadeau">
<organization></organization>
</author>
<author initials="N" surname="Sprecher">
<organization></organization>
</author>
<author initials="Y" surname="Weingarten">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<reference anchor="MPLS-TP-OAM-FWK"
target="draft-ietf-mpls-tp-oam-framework">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Operations, Administration and Maintenance Framework for MPLS-based Transport Networks</title>
<author initials="M" surname="Bocci">
<organization></organization>
</author>
<author initials="D" surname="Allan">
<organization></organization>
</author>
<date year="2010" />
</front>
</reference>
<?rfc include="reference.RFC.4447"?>
<?rfc include="reference.RFC.5921"?>
<reference anchor="ETH-OAM"
target="draft-ietf-ccamp-rsvp-te-eth-oam-ext">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>GMPLS RSVP-TE Extensions for Ethernet OAM</title>
<author initials="A" surname="Takacs">
<organization></organization>
</author>
<author initials="B" surname="Gero">
<organization></organization>
</author>
<author initials="D" surname="Fedyk">
<organization></organization>
</author>
<author initials="D" surname="Mohan">
<organization></organization>
</author>
<author initials="D" surname="Long">
<organization></organization>
</author>
<date year="2009" />
</front>
</reference>
<reference anchor="MPLS-TP OAM Analysis"
target="draft-ietf-mpls-tp-oam-analysis">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>MPLS-TP OAM Analysis</title>
<author initials="N" surname="Sprecher">
<organization></organization>
</author>
<author initials="Y" surname="Weingarten">
<organization></organization>
</author>
<author initials="E" surname="Bellagamba">
<organization></organization>
</author>
<date year="2011" />
</front>
</reference>
<reference anchor="LSP Ping"
target="RFC 3479">
<!-- the following is the minimum to make xml2rfc happy -->
<front>
<title>Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures</title>
<author initials="K" surname="Kompella">
<organization></organization>
</author>
<author initials="G" surname="Swallow">
<organization></organization>
</author>
<date year="2006" />
</front>
</reference>
</references>
<section anchor="app-additional" title="Additional Stuff">
<t>This becomes an Appendix.</t>
</section>
</back>
</rfc>
| PAFTECH AB 2003-2026 | 2026-04-23 12:11:09 |