Bidirectional Forwarding Detection (BFD) on Multi-chassis Ling Aggregation Group (MC-LAG) Interfaces in IP/MPLS Networks
draft-tanmir-rtgwg-bfd-mc-lag-mpls-01
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RTG Working Group G. Mirsky
Internet-Draft ZTE Corp.
Updates: 7130 (if approved) J. Tantsura
Intended status: Standards Track Individual
Expires: September 11, 2017 March 10, 2017
Bidirectional Forwarding Detection (BFD) on Multi-chassis Ling
Aggregation Group (MC-LAG) Interfaces in IP/MPLS Networks
draft-tanmir-rtgwg-bfd-mc-lag-mpls-01
Abstract
This document describes use of Bidirectional Forwarding Detection for
Multi-chassis Link Aggregation Group to provide faster than Link
Aggregation Control Protocol convergence. This specification
enhances and updates RFC 7130 "Bidirectional Forwarding Detection
(BFD) on Link Aggregation Group (LAG) Interfaces".
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
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 11, 2017.
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
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include Simplified BSD License text as described in Section 4.e of
Mirsky & Tantsura Expires September 11, 2017 [Page 1]
Internet-Draft BFD for MC-LAG over IP/MPLS March 2017
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions used in this document . . . . . . . . . . . . 2
1.1.1. Terminology . . . . . . . . . . . . . . . . . . . . . 2
1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3
2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 3
3. BFD on MC-LAG with IP/MPLS data plane . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
7. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
The [RFC7130] defines use of Bidirectional Forwarding Detection (BFD)
on Link Aggregation Group (LAG) interfaces. Multi-chassis LAG (MC-
LAG) is type of LAG [IEEE.802.1AX.2008] with member links terminated
on separate chassis. [IEEE.802.1AX.2008] does not specify MC-LAG but
doesn't preclude it either. Link Aggregation Control Protocol
(LACP), also defined in [IEEE.802.1AX.2008], can work with MC-LAG
but, as in LAG case, can detect link failure only in range of single
seconds. This document defines how mechanism defined to work on LAG
interfaces [RFC7130] can be adapted to MC-LAG case to enable sub-
second detection of member link failure.
1.1. Conventions used in this document
1.1.1. Terminology
ACH: Associated Channel Header
BFD: Bidirectional Forwarding Detection
BoS: Bottom of the Stack
G-ACh: Generic Associated Channel
GAL: Generic Associated Label
LAG: Link Aggregation Group
LACP: Link Aggregation Control Protocol
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MC-LAG: Multi-chassis Link Aggregation Group
MPLS: Multi-Protocol Label Switching
1.1.2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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