PIM DR Improvement
draft-ietf-pim-dr-improvement-09
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2019-10-25
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Submitted to IESG for Publication
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Stig Venaas
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(last changed 2019-10-27)
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Alvaro Retana
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Stig Venaas <stig@venaas.com>
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PIM WG Zheng. Zhang
Internet-Draft ZTE Corporation
Intended status: Standards Track Fangwei. Hu
Expires: April 27, 2020 Individual
Benchong. Xu
ZTE Corporation
Mankamana. Mishra
Cisco Systems
October 25, 2019
PIM DR Improvement
draft-ietf-pim-dr-improvement-09.txt
Abstract
Protocol Independent Multicast - Sparse Mode (PIM-SM) is widely
deployed multicast protocol. As deployment for PIM protocol is
growing day by day, user expects lower traffic loss and faster
convergence in case of any network failure. This document provides
an extension to the existing protocol which would improve the
stability of the PIM protocol with respect to traffic loss and
convergence time when the PIM 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 27, 2020.
Copyright Notice
Copyright (c) 2019 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
Zhang, et al. Expires April 27, 2020 [Page 1]
Internet-Draft PIM DR Improvement October 2019
(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 . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. PIM hello message format . . . . . . . . . . . . . . . . . . 4
3.1. DR Address Option format . . . . . . . . . . . . . . . . 4
3.2. BDR Address Option format . . . . . . . . . . . . . . . . 4
4. Protocol Specification . . . . . . . . . . . . . . . . . . . 5
4.1. Deployment Choice . . . . . . . . . . . . . . . . . . . . 6
4.2. Election Algorithm . . . . . . . . . . . . . . . . . . . 6
4.3. Sending Hello Messages . . . . . . . . . . . . . . . . . 7
4.4. Receiving Hello Messages . . . . . . . . . . . . . . . . 8
4.5. The treatment . . . . . . . . . . . . . . . . . . . . . . 9
4.6. Sender side . . . . . . . . . . . . . . . . . . . . . . . 10
5. Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Multicast technology is used widely. Many modern technologies, such
as IPTV, Net-Meeting, use PIM-SM to facilitate multicast service.
There are many events that will influence the quality of multicast
services. Like the change of unicast routes, the change of the PIM-
SM DR may cause the loss of multicast packets too.
After a DR on a shared-media LAN goes down, other routers will elect
a new DR after the expiration of Hello-Holdtime. The default value
of Hello-Holdtime is 105 seconds. Although the minimum Hello
interval can be adjusted to 1 second, the Hello-Holdtime is 3.5 times
Hello interval. Thus, the detection of DR Down event cannot be
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