Using BGP to Bind MPLS Labels to Address Prefixes
RFC 8277
| Document | Type |
RFC - Proposed Standard
(October 2017; No errata)
Obsoletes RFC 3107
|
|
|---|---|---|---|
| Last updated | 2017-10-19 | ||
| Replaces | draft-rosen-mpls-rfc3107bis | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Loa Andersson | ||
| Shepherd write-up | Show (last changed 2017-05-29) | ||
| IESG | IESG state | RFC 8277 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Deborah Brungard | ||
| Send notices to | Loa Andersson <loa@pi.nu> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) E. Rosen
Request for Comments: 8277 Juniper Networks, Inc.
Obsoletes: 3107 October 2017
Category: Standards Track
ISSN: 2070-1721
Using BGP to Bind MPLS Labels to Address Prefixes
Abstract
This document specifies a set of procedures for using BGP to
advertise that a specified router has bound a specified MPLS label
(or a specified sequence of MPLS labels organized as a contiguous
part of a label stack) to a specified address prefix. This can be
done by sending a BGP UPDATE message whose Network Layer Reachability
Information field contains both the prefix and the MPLS label(s) and
whose Next Hop field identifies the node at which said prefix is
bound to said label(s). This document obsoletes RFC 3107.
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/rfc8277.
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
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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.
Rosen Standards Track [Page 1]
RFC 8277 BGP and Labeled Address Prefixes October 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Using BGP to Bind an Address Prefix to One or More MPLS
Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Multiple Labels Capability . . . . . . . . . . . . . . . 6
2.2. NLRI Encoding When the Multiple Labels Capability Is
Not Used . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3. NLRI Encoding When the Multiple Labels Capability Is Used 10
2.4. How to Explicitly Withdraw the Binding of a Label to a
Prefix . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5. Changing the Label That Is Bound to a Prefix . . . . . . 13
3. Installing and/or Propagating SAFI-4 or SAFI-128 Routes . . . 14
3.1. Comparability of Routes . . . . . . . . . . . . . . . . . 14
3.2. Modification of Label(s) Field When Propagating . . . . . 14
3.2.1. When the Next Hop Field Is Unchanged . . . . . . . . 14
3.2.2. When the Next Hop Field Is Changed . . . . . . . . . 15
4. Data Plane . . . . . . . . . . . . . . . . . . . . . . . . . 16
5. Relationship between SAFI-4 and SAFI-1 Routes . . . . . . . . 18
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
7. Security Considerations . . . . . . . . . . . . . . . . . . . 19
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1. Normative References . . . . . . . . . . . . . . . . . . 20
8.2. Informative References . . . . . . . . . . . . . . . . . 22
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 23
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 23
1. Introduction
[RFC3107] specifies encodings and procedures for using BGP to
indicate that a particular router has bound either a single MPLS
label or a sequence of MPLS labels to a particular address prefix.
(A sequence of labels would be organized as a contiguous part of an
MPLS label stack as specified in [RFC3031] and [RFC3032].) This is
done by sending a BGP UPDATE message whose Network Layer Reachability
Information field contains both the prefix and the MPLS label(s) and
whose Next Hop field identifies the node at which said prefix is
bound to said label(s). Each such UPDATE also advertises a path to
the specified prefix via the specified next hop.
Rosen Standards Track [Page 2]
RFC 8277 BGP and Labeled Address Prefixes October 2017
Although there are many implementations and deployments of [RFC3107],
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