Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router (DR) Improvement
draft-ietf-pim-dr-improvement-10
PIM WG Z. Zhang
Internet-Draft ZTE Corporation
Intended status: Standards Track F. Hu
Expires: April 3, 2021 Individual
B. Xu
ZTE Corporation
M. Mishra
Cisco Systems
September 30, 2020
Protocol Independent Multicast - Sparse Mode (PIM-SM) Designated Router
(DR) Improvement
draft-ietf-pim-dr-improvement-10
Abstract
Protocol Independent Multicast - Sparse Mode (PIM-SM) is a widely
deployed multicast protocol. As deployment for the PIM protocol is
growing day by day, a user expects lower packet loss and faster
convergence regardless of the cause of the network failure. This
document defines an extension to the existing protocol, which
improves the PIM protocol's stability with respect to packet loss and
convergence time when the PIM Designated Router (DR) role changes.
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 April 3, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Zhang, et al. Expires April 3, 2021 [Page 1]
Internet-Draft PIM DR Improvement September 2020
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. Keywords . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Protocol Specification . . . . . . . . . . . . . . . . . . . 4
3.1. Election Algorithm . . . . . . . . . . . . . . . . . . . 5
3.2. Sending Hello Messages . . . . . . . . . . . . . . . . . 5
3.3. Receiving Hello Messages . . . . . . . . . . . . . . . . 6
3.4. Working with the DRLB function . . . . . . . . . . . . . 6
4. PIM Hello message format . . . . . . . . . . . . . . . . . . 7
4.1. DR Address Option format . . . . . . . . . . . . . . . . 7
4.2. BDR Address Option format . . . . . . . . . . . . . . . . 7
4.3. Error handling . . . . . . . . . . . . . . . . . . . . . 7
5. Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.1. Normative References . . . . . . . . . . . . . . . . . . 9
9.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Multicast technology, with PIM-SM ([RFC7761]), is used widely in
modern services like IPTV and Net-Meeting. Some events, such as
changes in unicast routes, or a change in the PIM-SM DR, may cause
the loss of multicast packets.
The PIM DR has two responsibilities in the PIM-SM protocol. For any
active sources on a LAN, the PIM DR is responsible for registering
with the Rendezvous Point (RP) if the group is operating in PIM-SM.
Also, the PIM DR is responsible for tracking local multicast
listeners and forwarding data to these listeners if the group is
operating in PIM-SM.
Show full document text