MVPN and MSDP SA Interoperation
draft-zzhang-bess-mvpn-msdp-sa-interoperation-00
BESS Z. Zhang
Internet-Draft L. Giuliano
Intended status: Standards Track Juniper Networks
Expires: March 31, 2018 September 27, 2017
MVPN and MSDP SA Interoperation
draft-zzhang-bess-mvpn-msdp-sa-interoperation-00
Abstract
This document specifies the procedures for interoperation between
MVPN Source Active routes and customer MSDP Source Active routes,
which is useful for MVPN provider networks offering services to
customers with an existing MSDP infrastructure. Without the
procedures described in this document, VPN-specific MSDP sessions are
required among the PEs that are customer MSDP peers.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC2119.
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
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This Internet-Draft will expire on March 31, 2018.
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document authors. All rights reserved.
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Internet-Draft mvpn-sa-msdp September 2017
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Table of Contents
1. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1. MVPN RPT-SPT Mode . . . . . . . . . . . . . . . . . . . . 4
3. Specification . . . . . . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
6. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Terminologies
Familiarity with MVPN and MSDP protocols and procedures is assumed.
Some terminologies are listed below for convenience.
o ASM: Any source multicast.
o SPT: Source-specific Shortest-path Tree.
o C-S: A multicast source address, identifying a multicast source
located at a VPN customer site.
o C-G: A multicast group address used by a VPN customer.
o C-RP: A multicast Rendezvous Point for a VPN customer.
o EC: Extended Community.
2. Introduction
Section "14. Supporting PIM-SM without Inter-Site Shared C-Trees" of
[RFC6514] specifies the procedures for MVPN PEs to discover (C-S,C-G)
via MVPN Source Active A-D routes and then send (C-S,C-G) C-multicast
routes towards the ingress PEs, to establish SPTs for customer ASM
flows for which they have downstream receivers. (C-*,C-G)
C-multicast routes are not sent among the PEs so inter-site shared
C-Trees are not used and the method is generally referred to as "spt-
only" mode.
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With this mode, the MVPN Source Active routes are functionally
similar MSDP Source-Active messages [RFC3618]. One or more of the
PEs, say PE1, either act as a C-RP and learn of (C-S,C-G) via PIM
Register messages, or have MSDP sessions with some MSDP peers and
learn (C-S,C-G) via MSDP SA messages. In either case, PE1 will then
originate MVPN SA routes for other PEs to learn the (C-S,C-G).
[RFC6514] only specifies that a PE receiving the MVPN SA routes, say
PE2, will advertise (C-S,C-G) C-multicast routes if it has
corresponding (C-*,C-G) state learnt from its CE. PE2 may also have
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