Bidirectional Forwarding Detection (BFD) for EVPN Ethernet Segment Failover Use Case
draft-zwm-bess-es-failover-01
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BESS WG Z. Zhang
Internet-Draft Y. Wang
Intended status: Standards Track G. Mirsky
Expires: April 25, 2020 ZTE Corporation
October 23, 2019
Bidirectional Forwarding Detection (BFD) for EVPN Ethernet Segment
Failover Use Case
draft-zwm-bess-es-failover-01.txt
Abstract
This document introduces a method for fast switchover of Designated
Forwarder for Ethernet Segment failover by using Bidirectional
Forwarding Detection protocol.
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
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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
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 25, 2020.
Copyright Notice
Copyright (c) 2019 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.
Zhang, et al. Expires April 25, 2020 [Page 1]
Internet-Draft EVPN ES Failover use case October 2019
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. Proposal . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Specification . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. BDF changes . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
7. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[RFC7432] introduces Ethernet Virtual Private Network (EVPN)
technology. Designated Forwarder (DF) election procedures for multi-
homing Ethernet Segments has been described in it. When PE (provider
edge) receives BUM (Broadcast, Unknown Unicast and Multicast) flows,
only DF forwards the BUM flows to CE (customer edge). Non-DFs do not
forward the BUM flows in order to avoid duplication. If the link
between DF and CE fails, another PE will forward the BUM flows after
it is elected as DF.
[RFC8584] defines the DF election framework, including that Backup
Designated Forwarder (BDF) can be elected as the next best for the
role. But before the BDF is elected as DF, the BUM flows are
discarded after the link between DF and CE fails.
+-----+
+-----X----+ PE1 |
| +--+--+
|
+-+--+
| CE |
+-+--+
|
| +--+--+
+----------+ PE2 |
+-----+
For example, CE is multihomed to PE1 and PE2. PE1 is elected as DF.
All BUM flows are forwarded by PE1 when the link between PE1 and CE
is operational. When the link between PE1 and CE fails, the BUM
flows are discarded until PE2 is elected as DF.
Zhang, et al. Expires April 25, 2020 [Page 2]
Internet-Draft EVPN ES Failover use case October 2019
This document will use terminology defined in [RFC7432] and
[I-D.ietf-bess-evpn-lsp-ping].
2. Conventions used in this document
2.1. Terminology
BFD: Bidirectional Forwarding Detection
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