Multiple Upstream Interface Support for IGMP/MLD Proxy
draft-asaeda-pim-multiif-igmpmldproxy-00
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PIM Working Group H. Asaeda
Internet-Draft K. Matsuzono
Expires: September 24, 2015 NICT
March 23, 2015
Multiple Upstream Interface Support for IGMP/MLD Proxy
draft-asaeda-pim-multiif-igmpmldproxy-00
Abstract
This document describes the way of supporting multiple upstream
interfaces for an IGMP/MLD proxy device. The proposed extension
enables an IGMP/MLD proxy device to receive multicast sessions/
channels through the different upstream interfaces. The upstream
interface is selected based on the pre-configured supported address
prefixes and interface priority value. A mechanism for upstream
interface takeover that switches from an inactive upstream interface
to an active upstream interface is also described.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 24, 2015.
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Copyright (c) 2015 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
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Asaeda & Matsuzono Expires September 24, 2015 [Page 1]
Internet-Draft Multiple Upstream for IGMP/MLD Proxy March 2015
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Upstream Selection Mechanism . . . . . . . . . . . . . . . . 5
3.1. Channel-Based Upstream Selection . . . . . . . . . . . . 5
3.2. Subscriber-Based Upstream Selection . . . . . . . . . . . 5
4. Upstream Interface Takeover . . . . . . . . . . . . . . . . . 5
5. Candidate Upstream Interface Configuration . . . . . . . . . 6
5.1. Subscriber Address Prefix and Supported Address Prefix . 7
5.2. Interface Priority . . . . . . . . . . . . . . . . . . . 8
5.3. Active Interval . . . . . . . . . . . . . . . . . . . . . 8
5.4. Default Upstream Interface . . . . . . . . . . . . . . . 9
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . 10
8.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
The Internet Group Management Protocol (IGMP) [2][4] for IPv4 and the
Multicast Listener Discovery Protocol (MLD) [3][4] for IPv6 are the
standard protocols for hosts to initiate joining or leaving of
multicast sessions. A proxy device performing IGMP/MLD-based
forwarding (as known as IGMP/MLD proxy) [5] maintains multicast
membership information by IGMP/MLD protocols on the downstream
interfaces and sends IGMP/MLD membership report messages via the
upstream interface to the upstream multicast routers when the
membership information changes (e.g., by receiving solicited/
unsolicited report messages). The proxy device forwards appropriate
multicast packets received on its upstream interface to each
downstream interface based on the downstream interface's
subscriptions.
According to the specification of [5], an IGMP/MLD proxy has *a
single* upstream interface and one or more downstream interfaces.
The multicast forwarding tree must be manually configured by
designating upstream and downstream interfaces on an IGMP/MLD proxy
device, and the root of the tree is expected to be connected to a
wider multicast infrastructure. An IGMP/MLD proxy device hence
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