Per multicast flow Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-per-mcast-flow-df-election-02
BESS WorkGroup Ali. Sajassi
Internet-Draft Mankamana. Mishra
Intended status: Standards Track Samir. Thoria
Expires: May 19, 2020 Cisco Systems
Jorge. Rabadan
Nokia
John. Drake
Juniper Networks
November 16, 2019
Per multicast flow Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-per-mcast-flow-df-election-02
Abstract
[RFC7432] describes mechanism to elect designated forwarder (DF) at
the granularity of (ESI, EVI) which is per VLAN (or per group of
VLANs in case of VLAN bundle or VLAN-aware bundle service). However,
the current level of granularity of per-VLAN is not adequate for some
applications.[I-D.ietf-bess-evpn-df-election-framework] improves base
line DF election by introducing HRW DF election.
[I-D.ietf-bess-evpn-igmp-mld-proxy] introduces applicability of EVPN
to Multicast flows, routes to sync them and a default DF election.
This document is an extension to HRW base draft
[I-D.ietf-bess-evpn-df-election-framework] and further enhances HRW
algorithm for the Multicast flows to do DF election at the
granularity of (ESI, VLAN, Mcast flow).
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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Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 19, 2020.
Sajassi, et al. Expires May 19, 2020 [Page 1]
Internet-DraftPer multicast flow Designated Forwarder ElectNovember 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. The DF Election Extended Community . . . . . . . . . . . . . 4
4. HRW base per multicast flow EVPN DF election . . . . . . . . 6
4.1. DF election for IGMP (S,G) membership request . . . . . . 6
4.2. DF election for IGMP (*,G) membership request . . . . . . 7
4.3. Default DF election procedure . . . . . . . . . . . . . . 7
5. Procedure to use per multicast flow DF election algorithm . . 8
6. Triggers for DF re-election . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
9. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 10
10. Normative References . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
EVPN based All-Active multi-homing is becoming the basic building
block for providing redundancy in next generation data center
deployments as well as service provider access/aggregation networks.
[RFC7432] defines the role of a designated forwarder as the node in
the redundancy group that is responsible to forward Broadcast,
Unknown unicast, Multicast (BUM) traffic on that Ethernet Segment (CE
device or network) in All-Active multi-homing.
The default DF election mechanism allows selecting a DF at the
granularity of (ES, VLAN) or (ES, VLAN bundle) for BUM traffic.
While [I-D.ietf-bess-evpn-df-election-framework] improve on the
default DF election procedure, some service provider residential
applications require a finer granularity, where whole multicast flows
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