MPLS Label Switched Path (LSP) Pseudowire (PW) Status Refresh Reduction for Static PWs
RFC 8237
Internet Engineering Task Force (IETF) L. Martini
Request for Comments: 8237 Monoski LLC
Category: Standards Track G. Swallow
ISSN: 2070-1721 SETC
E. Bellagamba
Ericsson
October 2017
MPLS Label Switched Path (LSP) Pseudowire (PW)
Status Refresh Reduction for Static PWs
Abstract
This document describes a method for generating an aggregated
pseudowire (PW) status message transmitted for a statically
configured PW on a Multiprotocol Label Switching (MPLS) Label
Switched Path (LSP) to indicate the status of one or more PWs carried
on the LSP.
The method for transmitting the PW status information is not new;
however, this protocol extension allows a Service Provider (SP) to
reliably monitor the individual PW status while not overwhelming the
network with multiple periodic status messages. This is achieved by
sending a single cumulative summary status verification message for
all the PWs grouped in the same LSP.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8237.
Martini, et al. Standards Track [Page 1]
RFC 8237 MPLS LSP PW Status Refresh Reduction October 2017
Copyright Notice
Copyright (c) 2017 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
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to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Martini, et al. Standards Track [Page 2]
RFC 8237 MPLS LSP PW Status Refresh Reduction October 2017
Table of Contents
1. Introduction ....................................................3
1.1. Requirements Language ......................................4
1.2. Terminology ................................................4
1.3. Notational Conventions .....................................5
2. PW Status Refresh Reduction Protocol ............................5
2.1. Protocol States ............................................5
2.1.1. INACTIVE ............................................5
2.1.2. STARTUP .............................................6
2.1.3. ACTIVE ..............................................6
2.2. Timer Value Change Transition Procedure ....................6
3. PW Status Refresh Reduction Procedure ...........................7
4. PW Status Refresh Reduction Message Encoding ....................8
5. PW Status Refresh Reduction Control Messages ...................11
5.1. Notification Message ......................................12
5.2. PW Configuration Message ..................................12
5.2.1. MPLS-TP Tunnel ID ..................................13
5.2.2. PW ID Configured List ..............................14
5.2.3. PW ID Unconfigured List ............................15
6. PW Provisioning Verification Procedure .........................15
6.1. PW ID List Advertising and Processing .....................16
7. Security Considerations ........................................16
8. IANA Considerations ............................................17
8.1. PW Status Refresh Reduction Message Types .................17
8.2. PW Configuration Message Sub-TLVs .........................17
8.3. PW Status Refresh Reduction Notification Codes ............18
8.4. PW Status Refresh Reduction Message Flags .................18
8.5. G-ACh Registry Allocation .................................19
8.6. Guidance for Designated Experts ...........................19
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