PIM DR Improvement
draft-ietf-pim-dr-improvement-04
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PIM WG Zheng. Zhang
Internet-Draft Fangwei. Hu
Intended status: Standards Track BenChong. Xu
Expires: June 13, 2018 ZTE Corporation
Mankamana. Prasad Mishra
Cisco Systems
December 10, 2017
PIM DR Improvement
draft-ietf-pim-dr-improvement-04.txt
Abstract
PIM is widely deployed multicast protocol. PIM protocol is defined
in [RFC4601] and [RFC7761]. As deployment for PIM protocol growing
day by day, user expect least traffic loss and fast convergence in
case of any network failure. This document provides extension to
existing defined protocol which would improve stability of PIM
protocol with respect to traffic loss and convergence time when the
PIM DR is down.
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 June 13, 2018.
Copyright Notice
Copyright (c) 2017 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
Zhang, et al. Expires June 13, 2018 [Page 1]
Internet-Draft PIM DR Improvement December 2017
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
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. PIM hello message format . . . . . . . . . . . . . . . . . . 3
3.1. DR Address Option format . . . . . . . . . . . . . . . . 4
3.2. BDR Address Option format . . . . . . . . . . . . . . . . 4
4. The Protocol Treatment . . . . . . . . . . . . . . . . . . . 4
4.1. Election Algorithm . . . . . . . . . . . . . . . . . . . 5
4.2. Sending Hello Messages . . . . . . . . . . . . . . . . . 6
4.3. Receiving Hello Messages . . . . . . . . . . . . . . . . 7
4.4. The treatment . . . . . . . . . . . . . . . . . . . . . . 8
4.5. Sender side . . . . . . . . . . . . . . . . . . . . . . . 9
5. Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 9
6. Deployment suggestion . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
9. Normative References . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Multicast technology is used widely. Many modern technology use PIM
technology, such as IPTV, Net-Meeting, and so on. There are many
events that will influence the quality of multicast services. The
change of unicast routes will cause the lost of multicast packets.
The change of DR cause the lost of multicast packets too.
When a DR on a share-media LAN is down, other routers will elect a
new DR until the expiration of Hello-Holdtime. The default value of
Hello-Holdtime is 105 seconds. Although the value of Hello-Holdtime
can be changed by manual, when the DR is down, there are still many
multicast packets will be lost. The quality of IPTV and Net-Meeting
will be influenced.
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