MPLS Upstream Label Assignment for LDP
RFC 6389
Internet Engineering Task Force (IETF) R. Aggarwal
Request for Comments: 6389 Juniper Networks
Category: Standards Track JL. Le Roux
ISSN: 2070-1721 Orange
November 2011
MPLS Upstream Label Assignment for LDP
Abstract
This document describes procedures for distributing upstream-assigned
labels for the Label Distribution Protocol (LDP). It also describes
how these procedures can be used for avoiding branch Label Switching
Router (LSR) traffic replication on a LAN for LDP point-to-multipoint
(P2MP) Label Switched Paths (LSPs).
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/rfc6389.
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Aggarwal & Le Roux Standards Track [Page 1]
RFC 6389 MPLS Upstream Label Assignment for LDP November 2011
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Table of Contents
1. Introduction ....................................................3
2. Specification of Requirements ...................................3
3. LDP Upstream Label Assignment Capability ........................3
4. Distributing Upstream-Assigned Labels in LDP ....................4
4.1. Procedures .................................................4
5. LDP Tunnel Identifier Exchange ..................................5
6. LDP Point-to-Multipoint LSPs on a LAN ...........................9
7. IANA Considerations ............................................11
7.1. LDP TLVs ..................................................11
7.2. Interface Type Identifiers ................................11
8. Security Considerations ........................................12
9. Acknowledgements ...............................................12
10. References ....................................................12
10.1. Normative References .....................................12
10.2. Informative References ...................................13
Aggarwal & Le Roux Standards Track [Page 2]
RFC 6389 MPLS Upstream Label Assignment for LDP November 2011
1. Introduction
This document describes procedures for distributing upstream-assigned
labels [RFC5331] for Label Distribution Protocol (LDP) [RFC5036].
These procedures follow the architecture for MPLS upstream label
assignment described in [RFC5331].
This document describes extensions to LDP that a Label Switching
Router (LSR) can use to advertise whether the LSR supports upstream
label assignment to its neighboring LSRs.
This document also describes extensions to LDP to distribute
upstream-assigned labels.
The usage of MPLS upstream label assignment using LDP to avoid branch
LSR traffic replication on a LAN for LDP point-to-multipoint (P2MP)
Label Switched Paths (LSPs) [RFC6388] is also described.
2. Specification of Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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