AC-Influenced Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-ac-df-01
BESS Workgroup J. Rabadan
Internet Draft K. Nagaraj
S. Sathappan
Intended status: Informational V. Prabhu
W. Henderickx
Nokia
A. Liu
Ericsson
W. Lin
Juniper Networks
Expires: October 13, 2017 April 11, 2017
AC-Influenced Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-ac-df-01
Abstract
The Designated Forwarder (DF) in EVPN networks is the PE responsible
for sending multicast, broadcast and unknown unicast traffic to a
multi-homed CE, on a given Ethernet Tag on a particular Ethernet
Segment (ES). The DF is selected based on the list of PEs that
advertise the Ethernet Segment Identifier (ESI) to the EVPN network.
While PE node or link failures trigger the DF re-election for a given
<ESI, EVI>, individual Attachment Circuit (AC) or MAC-VRF failures do
not trigger such DF re-election and the traffic may therefore be
permanently impacted, even though there is an alternative path. This
document improves the DF election algorithm so that the AC status can
influence the result of the election and this type of "logical"
failures can be protected too.
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), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
Rabadan et al. Expires October 13, 2017 [Page 1]
Internet-Draft AC-based DF election for EVPN April 11, 2017
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."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on October 13, 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
(http://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. Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 3
2. Solution Description . . . . . . . . . . . . . . . . . . . . . 4
2.1. Current DF Election Procedure And AC Failures . . . . . . . 5
2.2. The Attachment Circuit (AC) Influenced DF Election . . . . 6
2.3. AC-Influenced DF Election For VLAN-Aware Bundle Services . 7
3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . . 8
4. Conventions used in this document . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1. Normative References . . . . . . . . . . . . . . . . . . . 9
7.2. Informative References . . . . . . . . . . . . . . . . . . 9
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 9
Rabadan et al. Expires October 13, 2017 [Page 2]
Internet-Draft AC-based DF election for EVPN April 11, 2017
1. Problem Statement
[RFC7432] defines the Designated Forwarder (DF) as the EVPN PE
Show full document text