Fast failure detection in VRRP with Point to Point BFD
draft-ietf-rtgwg-vrrp-bfd-p2p-00
Network Working Group N. Gupta
Internet-Draft A. Dogra
Intended status: Standards Track Cisco Systems, Inc.
Expires: August 2, 2018 C. Docherty
AT&T
G. Mirsky
J. Tantsura
Individual
January 29, 2018
Fast failure detection in VRRP with Point to Point BFD
draft-ietf-rtgwg-vrrp-bfd-p2p-00
Abstract
This document describes how Point to Point Bidirectional Forwarding
Detection (BFD) can be used to support sub-second detection of a
Master Router failure in the Virtual Router Redundancy Protocol
(VRRP).
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This Internet-Draft will expire on August 2, 2018.
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Gupta, et al. Expires August 2, 2018 [Page 1]
Internet-Draft VRRP BFD January 2018
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4
3. Applicability of Point to Point BFD . . . . . . . . . . . . . 5
3.1. Extension to VRRP protocol . . . . . . . . . . . . . . . . 5
3.2. VRRP Peer Table . . . . . . . . . . . . . . . . . . . . . 6
3.3. VRRP BACKUP ADVERTISEMENT Packet Type . . . . . . . . . . 7
3.4. Sample configuration . . . . . . . . . . . . . . . . . . . 8
3.5. Critical BFD session . . . . . . . . . . . . . . . . . . . 9
3.6. Protocol State Machine . . . . . . . . . . . . . . . . . . 9
3.6.1. Parameters Per Virtual Router . . . . . . . . . . . . 9
3.6.2. Timers . . . . . . . . . . . . . . . . . . . . . . . . 10
3.6.3. VRRP State Machine with Point to Point BFD . . . . . . 10
4. Scalability Considerations . . . . . . . . . . . . . . . . . . 20
5. Operational Considerations . . . . . . . . . . . . . . . . . . 21
6. Applicability to VRRPv2 . . . . . . . . . . . . . . . . . . . 22
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
7.1. A New Name Space for VRRP Packet Types . . . . . . . . . . 23
8. Security Considerations . . . . . . . . . . . . . . . . . . . 24
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 25
10. Normative References . . . . . . . . . . . . . . . . . . . . . 26
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 27
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1. Introduction
The Virtual Router Redundancy Protocol (VRRP) provides redundant
Virtual gateways in the Local Area Network (LAN), which is typically
the first point of failure for end-hosts sending traffic out of the
LAN. Fast failure detection of VRRP Master is critical in supporting
high availability of services and improved Quality of Experience to
users. In VRRP [RFC5798] specification, Backup routers depend on
VRRP packets generated at a regular interval by the Master router, to
detect the health of the VRRP Master. Faster failure detection can
be achieved within VRRP protocol by reducing the Advertisement and
Master Down Interval. However, sub second Advert timers, can put
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