Multicast Source Redundancy in EVPN Networks
draft-ietf-bess-evpn-redundant-mcast-source-00
BESS Workgroup J. Rabadan, Ed.
Internet-Draft J. Kotalwar
Intended status: Standards Track S. Sathappan
Expires: July 22, 2021 Nokia
Z. Zhang
W. Lin
Juniper
E. Rosen
Individual
January 18, 2021
Multicast Source Redundancy in EVPN Networks
draft-ietf-bess-evpn-redundant-mcast-source-00
Abstract
EVPN supports intra and inter-subnet IP multicast forwarding.
However, EVPN (or conventional IP multicast techniques for that
matter) do not have a solution for the case where: a) a given
multicast group carries more than one flow (i.e., more than one
source), and b) it is desired that each receiver gets only one of the
several flows. Existing multicast techniques assume there are no
redundant sources sending the same flow to the same IP multicast
group, and, in case there were redundant sources, the receiver's
application would deal with the received duplicated packets. This
document extends the existing EVPN specifications and assumes that IP
Multicast source redundancy may exist. It also assumes that, in case
two or more sources send the same IP Multicast flows into the tenant
domain, the EVPN PEs need to avoid that the receivers get packet
duplication by following the described procedures.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
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."
This Internet-Draft will expire on July 22, 2021.
Rabadan, et al. Expires July 22, 2021 [Page 1]
Internet-Draft EVPN Redundant Sources January 2021
Copyright Notice
Copyright (c) 2021 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
(https://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. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Background on IP Multicast Delivery in EVPN Networks . . 6
1.2.1. Intra-subnet IP Multicast Forwarding . . . . . . . . 6
1.2.2. Inter-subnet IP Multicast Forwarding . . . . . . . . 7
1.3. Multi-Homed IP Multicast Sources in EVPN . . . . . . . . 8
1.4. The Need for Redundant IP Multicast Sources in EVPN . . . 10
2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 10
3. BGP EVPN Extensions . . . . . . . . . . . . . . . . . . . . . 12
4. Warm Standby (WS) Solution for Redundant G-Sources . . . . . 13
4.1. WS Example in an OISM Network . . . . . . . . . . . . . . 15
4.2. WS Example in a Single-BD Tenant Network . . . . . . . . 17
5. Hot Standby (HS) Solution for Redundant G-Sources . . . . . . 18
5.1. Use of BFD in the HS Solution . . . . . . . . . . . . . . 21
5.2. HS Example in an OISM Network . . . . . . . . . . . . . . 22
5.3. HS Example in a Single-BD Tenant Network . . . . . . . . 26
6. Security Considerations . . . . . . . . . . . . . . . . . . . 26
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 26
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.1. Normative References . . . . . . . . . . . . . . . . . . 26
8.2. Informative References . . . . . . . . . . . . . . . . . 27
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 28
Show full document text