Bidirectional Forwarding Detection (BFD) for Multi-point Networks and Protocol Independent Multicast - Sparse Mode (PIM-SM) Use Case
draft-ietf-pim-bfd-p2mp-use-case-05
Document | Type | Active Internet-Draft (pim WG) | |
---|---|---|---|
Authors | Greg Mirsky , Ji Xiaoli | ||
Last updated | 2021-01-29 (latest revision 2020-11-30) | ||
Replaces | draft-mirsky-pim-bfd-p2mp-use-case | ||
Stream | IETF | ||
Intended RFC status | Proposed Standard | ||
Formats | plain text xml pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Mike McBride | ||
Shepherd write-up | Show (last changed 2021-01-29) | ||
IESG | IESG state | Publication Requested | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Alvaro Retana | ||
Send notices to | mmcbride7@gmail.com |
PIM Working Group G. Mirsky Internet-Draft ZTE Corp. Intended status: Standards Track J. Xiaoli Expires: June 3, 2021 ZTE Corporation November 30, 2020 Bidirectional Forwarding Detection (BFD) for Multi-point Networks and Protocol Independent Multicast - Sparse Mode (PIM-SM) Use Case draft-ietf-pim-bfd-p2mp-use-case-05 Abstract This document discusses the use of Bidirectional Forwarding Detection (BFD) for multi-point networks to provide nodes that participate in Protocol Independent Multicast - Sparse Mode (PIM-SM) with the sub- second convergence. Optional extension to PIM-SM Hello, as specified in RFC 7761, to bootstrap point-to-multipoint BFD session. also defined in this document. 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 3, 2021. Copyright Notice Copyright (c) 2020 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 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must Mirsky & Xiaoli Expires June 3, 2021 [Page 1] Internet-Draft BFD P2MP Use in PIM-SM November 2020 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. Conventions used in this document . . . . . . . . . . . . 3 1.1.1. Acronyms . . . . . . . . . . . . . . . . . . . . . . 3 1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3 2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 4 3. Applicability of p2mp BFD . . . . . . . . . . . . . . . . . . 4 3.1. Using P2MP BFD in PIM DR/BDR Monitoring . . . . . . . . . 4 3.2. P2MP BFD in PIM DR Load Balancing . . . . . . . . . . . . 5 3.3. Multipoint BFD Encapsulation . . . . . . . . . . . . . . 6 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 5. Security Considerations . . . . . . . . . . . . . . . . . . . 7 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 7 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1. Normative References . . . . . . . . . . . . . . . . . . 7 7.2. Informative References . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8 1. Introduction Faster convergence in the control plane, in general, is beneficial and allows minimizing periods of traffic blackholing, transient routing loops, and other scenarios that may negatively affect service data flow. That equally applies to unicast and multicast routing protocols. [RFC7761] is the current specification of the Protocol Independent Multicast - Sparse Mode (PIM-SM) for IPv4 and IPv6 networks. Confirming implementation of PIM-SM elects a Designated Router (DR) on each PIM-SM interface. When a group of PIM-SM nodes is connected to shared-media segment, e.g., Ethernet, the one elected as DR is to act on behalf of directly connected hosts in the context of the PIM- SM protocol. Failure of the DR impacts the quality of the multicast services it provides to directly connected hosts because the default failure detection interval for PIM-SM routers is 105 seconds. Introduction of Backup DR (BDR), proposed in [I-D.ietf-pim-dr-improvement], improves convergence time in the PIM- SM over shared-media segment but still depends on long failure detection interval. Bidirectional Forwarding Detection (BFD) [RFC5880] had been originally defined to detect failure of point-to-point (p2p) paths -Show full document text