PIM DR Improvement
draft-ietf-pim-dr-improvement-00
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PIM WG Zheng. Zhang
Internet-Draft Fangwei. Hu
Intended status: Standards Track BenChong. Xu
Expires: September 2, 2016 ZTE Corporation
March 1, 2016
PIM DR Improvement
draft-ietf-pim-dr-improvement-00.txt
Abstract
PIM is worldly deployed multicast protocol. This document will
improve the stability of PIM protocol, decrease the lost of multicast
packets when the PIM DR (Designed Router) 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
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Drafts is at http://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 September 2, 2016.
Copyright Notice
Copyright (c) 2016 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
(http://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.
Zhang, et al. Expires September 2, 2016 [Page 1]
Internet-Draft PIM DR Improvement March 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. PIM hello message format . . . . . . . . . . . . . . . . . . 3
3.1. DR Option format . . . . . . . . . . . . . . . . . . . . 3
3.2. BDR Option format . . . . . . . . . . . . . . . . . . . . 4
4. The Protocol Treatment . . . . . . . . . . . . . . . . . . . 4
4.1. Sending Hello Messages . . . . . . . . . . . . . . . . . 5
4.2. Receiving Hello Messages . . . . . . . . . . . . . . . . 5
4.3. The election of DR and BDR . . . . . . . . . . . . . . . 5
5. Deployment suggestion . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. Normative References . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
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. Except
the unicast routes changing 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.
\ /
\ /
------- -------
| A | | B |
------- -------
| DR |
| |
------- -------
| SW |-----------------------------| SW |
------- -------
| |
Figure 1: An example of multicast network
For example, there were two routers on one Ethernet. RouterA was
elected to DR. When RouterA is down, the multicast packets are
Zhang, et al. Expires September 2, 2016 [Page 2]
Internet-Draft PIM DR Improvement March 2016
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