Controller Based BGP Multicast Signaling
draft-ietf-bess-bgp-multicast-controller-05
BESS Z. Zhang
Internet-Draft Juniper Networks
Intended status: Standards Track R. Raszuk
Expires: March 26, 2021 Bloomberg LP
D. Pacella
Verizon
A. Gulko
Refinitiv
September 22, 2020
Controller Based BGP Multicast Signaling
draft-ietf-bess-bgp-multicast-controller-05
Abstract
This document specifies a way that one or more centralized
controllers can use BGP to set up a multicast distribution tree in a
network. In the case of labeled tree, the labels are assigned by the
controllers either from the controllers' local label spaces, or from
a common Segment Routing Global Block (SRGB), or from each routers
Segment Routing Local Block (SRLB) that the controllers learn. In
case of labeled unidirectional tree and label allocation from the
common SRGB or from the controllers' local spaces, a single common
label can be used for all routers on the tree to send and receive
traffic with. Since the controllers calculate the trees, they can
use sophisticated algorithms and constraints to achieve traffic
engineering.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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/.
Zhang, et al. Expires March 26, 2021 [Page 1]
Internet-Draft bgp-mcast-controller September 2020
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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This Internet-Draft will expire on March 26, 2021.
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Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Resilience . . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Signaling . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4. Label Allocation . . . . . . . . . . . . . . . . . . . . 5
1.4.1. Using a Common per-tree Label for All Routers . . . . 6
1.4.2. Upstream-assignment from Controller's Local Label
Space . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5. Determining Root/Leaves . . . . . . . . . . . . . . . . . 8
1.5.1. PIM-SSM/Bidir or mLDP . . . . . . . . . . . . . . . . 8
1.5.2. PIM ASM . . . . . . . . . . . . . . . . . . . . . . . 8
1.6. Multiple Domains . . . . . . . . . . . . . . . . . . . . 9
1.7. SR-P2MP . . . . . . . . . . . . . . . . . . . . . . . . . 10
2. Specification . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1. Enhancements to TEA . . . . . . . . . . . . . . . . . . . 11
2.1.1. Any-Encapsulation Tunnel . . . . . . . . . . . . . . 11
2.1.2. Load-balancing Tunnel . . . . . . . . . . . . . . . . 11
2.1.3. Receiving MPLS Label Stack . . . . . . . . . . . . . 12
2.1.4. RPF Sub-TLV . . . . . . . . . . . . . . . . . . . . . 12
2.1.5. Tree Label Stack sub-TLV . . . . . . . . . . . . . . 12
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