Internet Engineering Task Force (IETF) Q. Zhao
Request for Comments: 7307 Huawei Technology
Category: Standards Track K. Raza
ISSN: 2070-1721 C. Zhou
Cisco Systems
L. Fang
Microsoft
L. Li
China Mobile
D. King
Old Dog Consulting
July 2014
LDP Extensions for Multi-Topology
Abstract
Multi-Topology (MT) routing is supported in IP networks with the use
of MT-aware IGPs. In order to provide MT routing within
Multiprotocol Label Switching (MPLS) Label Distribution Protocol
(LDP) networks, new extensions are required.
This document describes the LDP protocol extensions required to
support MT routing in an MPLS environment.
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 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7307.
Zhao, et al. Standards Track [Page 1]RFC 7307 LDP Multi-Topology Extensions July 2014Copyright Notice
Copyright (c) 2014 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
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Zhao, et al. Standards Track [Page 2]RFC 7307 LDP Multi-Topology Extensions July 2014Table of Contents
1. Introduction ....................................................4
2. Terminology .....................................................4
3. Signaling Extensions ............................................5
3.1. Topology-Scoped Forwarding Equivalence Class (FEC) .........5
3.2. New Address Families: MT IP ................................5
3.3. LDP FEC Elements with MT IP AF .............................6
3.4. IGP MT-ID Mapping and Translation ..........................7
3.5. LDP MT Capability Advertisement ............................7
3.5.1. Protocol Extension ..................................7
3.5.2. Procedures ..........................................9
3.6. Label Spaces ..............................................10
3.7. Reserved MT-ID Values .....................................10
4. MT Applicability on FEC-Based Features .........................10
4.1. Typed Wildcard FEC Element ................................10
4.2. Signaling LDP Label Advertisement Completion ..............11
4.3. LSP Ping ..................................................11
4.3.1. New FEC Sub-Types ..................................11
4.3.2. MT LDP IPv4 FEC Sub-TLV ............................12
4.3.3. MT LDP IPv6 FEC Sub-TLV ............................13
4.3.4. Operation Considerations ...........................13
5. Error Handling .................................................14
5.1. MT Error Notification for Invalid Topology ID .............14
6. Backwards Compatibility ........................................14
7. MPLS Forwarding in MT ..........................................14
8. Security Considerations ........................................14
9. IANA Considerations ............................................15
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