AC-influenced Designated Forwarder Election for (PBB-)EVPN
draft-rabadan-bess-evpn-ac-df-00
BESS Workgroup J. Rabadan
Internet Draft K. Nagaraj
S. Sathappan
Intended status: Standards Track W. Henderickx
Alcatel-Lucent
Expires: April 27, 2015 October 24, 2014
AC-influenced Designated Forwarder Election for (PBB-)EVPN
draft-rabadan-bess-evpn-ac-df-00
Abstract
The Designated Forwarder (DF) in (PBB-)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
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Table of Contents
1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 2
2. Solution description . . . . . . . . . . . . . . . . . . . . . 4
2.1. AC-influenced DF Election for EVPN . . . . . . . . . . . . 4
2.1.1. Current DF election procedure and AC failures . . . . . 5
2.1.2. The Attachment Circuit (AC) influenced DF election . . 6
2.2. AC-influenced DF Election for PBB-EVPN . . . . . . . . . . 7
2.2.1. Current DF election procedure and AC failures . . . . . 8
2.2.2. BGP encoding for advertising ACS per <ESI, ISID> . . . 9
2.2.3. The AC-influenced DF Election . . . . . . . . . . . . . 10
3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . . 11
4. Conventions used in this document . . . . . . . . . . . . . . . 11
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . . 12
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
1. Problem Statement
[EVPN] defines the Designated Forwarder (DF) as the (PBB-)EVPN PE
responsible for:
Rabadan et al. Expires April 27, 2015 [Page 2]
Internet-Draft AC-based DF election for EVPN October 24, 2014
o Flooding Broadcast, Unknown unicast and Multicast traffic (BUM), on
a given Ethernet Tag on a particular Ethernet Segment (ES), to the
CE. This is valid for single-active and all-active EVPN
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