Network Working Group Luca Martini (Ed.)
Internet Draft Cisco Systems Inc.
Expiration Date: June 2013
Intended status: Standards Track Matthew Bocci (Ed.)
Florin Balus (Ed.)
Alcatel-Lucent
December 11, 2012
Dynamic Placement of Multi Segment Pseudowires
draft-ietf-pwe3-dynamic-ms-pw-16.txt
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Abstract
There is a requirement for service providers to be able to extend the
reach of pseudowires (PW) across multiple Packet Switched Network
domains. A Multi-Segment PW is defined as a set of two or more
contiguous PW segments that behave and function as a single point-
to-point PW. This document describes extensions to the PW control
protocol to dynamically place the segments of the multi segment
pseudowire among a set of Provider Edge (PE) routers.
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Internet Draft draft-ietf-pwe3-dynamic-ms-pw-16.txt December 11, 2012
Table of Contents
1 Major Co-authors ..................................... 3
2 Acknowledgements ..................................... 3
3 Introduction ......................................... 3
3.1 Scope ................................................ 3
3.2 Specification of Requirements ........................ 3
3.3 Terminology .......................................... 4
3.4 Architecture Overview ................................ 4
4 Applicability ........................................ 6
4.1 Changes to Existing PW Signaling ..................... 6
5 PW Layer 2 Addressing ................................ 6
5.1 Attachment Circuit Addressing ........................ 6
5.2 S-PE Addressing ...................................... 7
6 Dynamic Placement of MS-PWs .......................... 7
6.1 Pseudowire Routing Procedures ........................ 8
6.1.1 AII PW Routing Table Lookup Aggregation Rules ........ 8
6.1.2 PW Static Route ...................................... 9
6.1.3 Dynamic Advertisement with BGP ....................... 9
6.2 LDP Signaling ........................................ 10
6.2.1 MS-PW Bandwidth Signaling ............................ 10
6.2.2 Equal Cost Multi Path (ECMP) in PW Routing ........... 12
6.2.3 Active/Passive T-PE Election Procedure ............... 12
6.2.4 Detailed Signaling Procedures ........................ 13
7 Failure Handling Procedures .......................... 14
7.1 PSN Failures ......................................... 14
7.2 S-PE Specfic Failures ................................ 14
7.3 PW Reachability Changes .............................. 15
8 Operations and Maintenance (OAM) ..................... 16
9 Security Considerations .............................. 16
10 IANA Considerations .................................. 16
10.1 LDP TLV TYPE NAME SPACE .............................. 17
10.2 LDP Status Codes ..................................... 17
10.3 BGP SAFI ............................................. 17
11 Normative References ................................. 17
12 Informative References ............................... 18
13 Author's Addresses ................................... 18
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Internet Draft draft-ietf-pwe3-dynamic-ms-pw-16.txt December 11, 2012
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