Bootstrap Router (BSR) Mechanism for Protocol Independent Multicast (PIM)
RFC 5059
Document | Type |
RFC - Proposed Standard
(January 2008; Errata)
Updated by RFC 8736
Obsoletes RFC 2362
Updates RFC 4601
Was draft-ietf-pim-sm-bsr (pim WG)
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Authors | Nidhi Bhaskar , Alexander Gall , James Lingard , Stig Venaas | ||
Last updated | 2020-01-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5059 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | David Ward | ||
Send notices to | (None) |
Network Working Group N. Bhaskar Request for Comments: 5059 Arastra Obsoletes: 2362 A. Gall Updates: 4601 SWITCH Category: Standards Track J. Lingard Arastra S. Venaas UNINETT January 2008 Bootstrap Router (BSR) Mechanism for Protocol Independent Multicast (PIM) Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract This document specifies the Bootstrap Router (BSR) mechanism for the class of multicast routing protocols in the PIM (Protocol Independent Multicast) family that use the concept of a Rendezvous Point as a means for receivers to discover the sources that send to a particular multicast group. BSR is one way that a multicast router can learn the set of group-to-RP mappings required in order to function. The mechanism is dynamic, largely self-configuring, and robust to router failure. Bhaskar, et al. Standards Track [Page 1] RFC 5059 BSR Mechanism for PIM January 2008 Table of Contents 1. Introduction ....................................................3 1.1. Background .................................................3 1.2. Protocol Overview ..........................................5 1.3. Administrative Scoping and BSR .............................6 2. BSR State and Timers ............................................8 3. Bootstrap Router Election and RP-Set Distribution ...............9 3.1. Bootstrap Router Election ..................................9 3.1.1. Per-Scope-Zone Candidate-BSR State Machine .........10 3.1.2. Per-Scope-Zone State Machine for Non-Candidate-BSR Routers ..........................11 3.1.3. Bootstrap Message Processing Checks ................13 3.1.4. State Machine Transition Events ....................14 3.1.5. State Machine Actions ..............................15 3.2. Sending Candidate-RP-Advertisement Messages ...............17 3.3. Creating the RP-Set at the BSR ............................18 3.4. Forwarding Bootstrap Messages .............................21 3.5. Bootstrap Messages to New and Rebooting Routers ...........22 3.5.1. No-Forward Bootstrap Messages ......................23 3.5.2. Unicasting Bootstrap Messages ......................23 3.6. Receiving and Using the RP-Set ............................23 4. Message Formats ................................................24 4.1. Bootstrap Message Format ..................................26 4.1.1. Semantic Fragmentation of BSMs .....................30 4.2. Candidate-RP-Advertisement Message Format .................31 5. Timers and Timer Values ........................................33 6. Security Considerations ........................................36 6.1. Possible Threats ..........................................36 6.2. Limiting Third-Party DoS Attacks ..........................36 6.3. Bootstrap Message Security ................................37 6.3.1. Unicast Bootstrap Messages .........................37 6.3.2. Multi-Access Subnets ...............................38 6.4. Candidate-RP-Advertisement Message Security ...............38 6.4.1. Non-Cryptographic Security of C-RP-Adv Messages ....38 6.4.2. Cryptographic Security of C-RP-Adv Messages ........39 6.5. Denial of Service using IPsec .............................39 7. Contributors ...................................................40 8. Acknowledgments ................................................40 9. Normative References ...........................................40 10. Informative References ........................................41 Bhaskar, et al. Standards Track [Page 2] RFC 5059 BSR Mechanism for PIM January 2008 1. Introduction This document assumes some familiarity with the concepts of Protocol Independent Multicast - Sparse Mode (PIM-SM) [1] and BidirectionalShow full document text