PIM DR Improvement
draft-ietf-pim-dr-improvement-07
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PIM WG Zheng. Zhang
Internet-Draft Fangwei. Hu
Intended status: Standards Track Benchong. Xu
Expires: July 21, 2019 ZTE Corporation
Mankamana. Mishra
Cisco Systems
January 17, 2019
PIM DR Improvement
draft-ietf-pim-dr-improvement-07.txt
Abstract
Protocol Independent Multicast - Sparse Mode (PIM-SM) is widely
deployed multicast protocol. PIM protocol is defined in [RFC7761].
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 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 July 21, 2019.
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
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
Zhang, et al. Expires July 21, 2019 [Page 1]
Internet-Draft PIM DR Improvement January 2019
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. Deployment suggestion . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
10.1. Normative References . . . . . . . . . . . . . . . . . . 11
10.2. 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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