BGP signalled private MPLS-labels
draft-kaliraj-bess-bgp-sig-private-mpls-labels-01
Network Working Group K. Vairavakkalai
Internet-Draft M. Jeyananth
Intended status: Experimental Juniper Networks, Inc.
Expires: February 19, 2021 August 18, 2020
BGP signalled private MPLS-labels
draft-kaliraj-bess-bgp-sig-private-mpls-labels-01
Abstract
The MPLS-forwarding-layer in a core network is a shared resource.
The MPLS FIB at nodes in this layer contains labels that are
dynamically allocated and locally significant at that node.
For some usecases like upstream-label-allocation, it is useful to be
able to create virtual private MPLS-forwarding-layers over this
shared MPLS-forwarding-layer. This allows installing deterministic
private label-values in the private-FIBs created at nodes
participating in this private MPLS forwarding-layer, while preserving
the "locally significant" nature of the underlying shared 'public'
MPLS-forwarding-layer.
This specification describes the procedures to create such virtual
private MPLS-forwarding layers (private MPLS-planes) using a new BGP
family. And gives a few example use-cases on how this private
forwarding-layers can be used.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
Vairavakkalai & JeyanantExpires February 19, 2021 [Page 1]
Internet-Draft Private MPLS-label namespaces August 2020
This Internet-Draft will expire on February 19, 2021.
Copyright Notice
Copyright (c) 2020 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Constructs and building blocks . . . . . . . . . . . . . . . 4
3.1. Context Protocol Nexthop Address . . . . . . . . . . . . 4
3.2. MPLS context FIB . . . . . . . . . . . . . . . . . . . . 4
3.3. Context Label . . . . . . . . . . . . . . . . . . . . . . 5
3.4. Roles of nodes in a MPLS-plane . . . . . . . . . . . . . 5
3.4.1. Edge-nodes (PLER) . . . . . . . . . . . . . . . . . . 5
3.4.2. Transit-nodes (PLSR) . . . . . . . . . . . . . . . . 5
3.5. Sending traffic into the MPLS plane . . . . . . . . . . . 5
4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. BGP families, routes and encoding . . . . . . . . . . . . . . 7
5.1. New address-families . . . . . . . . . . . . . . . . . . 7
5.1.1. AFI: MPLS, SAFI: 128 . . . . . . . . . . . . . . . . 7
5.1.2. AFI: MPLS, SAFI: 1 . . . . . . . . . . . . . . . . . 8
5.2. Routes and Operational procedures . . . . . . . . . . . . 8
5.2.1. "Context-Nexthop" discovery route . . . . . . . . . . 8
5.2.2. "Private Label" routes . . . . . . . . . . . . . . . 8
6. Example of Usecases . . . . . . . . . . . . . . . . . . . . . 10
6.1. Mezanine transport layer in a Seamless-MPLS network . . . 10
6.2. Service Forwarding Helper usecase . . . . . . . . . . . . 11
6.3. Standard BGP API to a MPLS network's forwarding-plane . . 12
6.4. Traffic engineering and Security advantages . . . . . . . 12
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
8. Security Considerations . . . . . . . . . . . . . . . . . . . 13
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
Show full document text