AC-influenced Designated Forwarder Election for EVPN
draft-rabadan-bess-evpn-ac-df-04
BESS Workgroup J. Rabadan
Internet Draft K. Nagaraj
S. Sathappan
Intended status: Informational V. Prabhu
W. Henderickx
Nokia
A. Liu
Ericsson
Expires: January 8, 2017 July 7, 2016
AC-influenced Designated Forwarder Election for EVPN
draft-rabadan-bess-evpn-ac-df-04
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
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Table of Contents
1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 2
2. Solution description . . . . . . . . . . . . . . . . . . . . . 4
2.1. Current DF election procedure and AC failures . . . . . . . 5
2.2. The Attachment Circuit (AC) influenced DF election . . . . 5
3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . . 7
4. Conventions used in this document . . . . . . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . . 8
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Problem Statement
[RFC7432] defines the Designated Forwarder (DF) as the EVPN PE
responsible for:
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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
multi-homing.
o Sending unicast traffic on a given Ethernet Tag on a particular ES
to the CE. This is valid for single-active multi-homing.
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