AC-Influenced Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-ac-df-00
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: April 14, 2017 October 11, 2016
AC-Influenced Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-ac-df-00
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.
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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 April 14, 2017 [Page 1]
Internet-Draft AC-based DF election for EVPN October 11, 2016
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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
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Internet-Draft AC-based DF election for EVPN October 11, 2016
1. Problem Statement
[RFC7432] defines the Designated Forwarder (DF) as the EVPN PE
responsible for:
o Flooding Broadcast, Unknown unicast and Multicast traffic (BUM), on
a given Ethernet Tag on a particular Ethernet Segment (ES), to the
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