Multicast Router Discovery
RFC 4286
Network Working Group B. Haberman
Request for Comments: 4286 JHU APL
Category: Standards Track J. Martin
Netzwert AG
December 2005
Multicast Router Discovery
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.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
The concept of Internet Group Management Protocol (IGMP) and
Multicast Listener Discovery (MLD) snooping requires the ability to
identify the location of multicast routers. Since snooping is not
standardized, there are many mechanisms in use to identify the
multicast routers. However, this can lead to interoperability issues
between multicast routers and snooping switches from different
vendors.
This document introduces a general mechanism that allows for the
discovery of multicast routers. This new mechanism, Multicast Router
Discovery (MRD), introduces a standardized means of identifying
multicast routers without a dependency on particular multicast
routing protocols.
Haberman, et al. Standards Track [Page 1]
RFC 4286 Multicast Router Discovery December 2005
Table of Contents
1. Introduction ....................................................3
2. Protocol Overview ...............................................3
3. Multicast Router Advertisement ..................................4
3.1. Advertisement Configuration Variables ......................4
3.1.1. AdvertisementInterval ...............................5
3.1.2. AdvertisementJitter .................................5
3.1.3. MaxInitialAdvertisementInterval .....................5
3.1.4. MaxInitialAdvertisements ............................5
3.1.5. NeighborDeadInterval ................................5
3.1.6. MaxMessageRate ......................................6
3.2. Advertisement Packet Format ................................6
3.2.1. Type Field ..........................................6
3.2.2. Advertisement Interval Field ........................6
3.2.3. Checksum Field ......................................6
3.2.4. Query Interval Field ................................7
3.2.5. Robustness Variable Field ...........................7
3.3. IP Header Fields ...........................................7
3.3.1. Source Address ......................................7
3.3.2. Destination Address .................................7
3.3.3. Time-to-Live / Hop Limit ............................7
3.3.4. IPv4 Protocol .......................................7
3.3.5. IPv6 Next Header ....................................7
3.4. Sending Multicast Router Advertisements ....................8
3.5. Receiving Multicast Router Advertisements ..................8
4. Multicast Router Solicitation ...................................9
4.1. Solicitation Packet Format .................................9
4.1.1. Type Field ..........................................9
4.1.2. Reserved Field ......................................9
4.1.3. Checksum Field ......................................9
4.2. IP Header Fields ..........................................10
4.2.1. Source Address .....................................10
4.2.2. Destination Address ................................10
4.2.3. Time-to-Live / Hop Limit ...........................10
4.2.4. IPv4 Protocol ......................................10
4.2.5. IPv6 Next Header ...................................10
4.3. Sending Multicast Router Solicitations ....................10
4.4. Receiving Multicast Router Solicitations ..................10
5. Multicast Router Termination ...................................11
5.1. Termination Packet Format .................................11
5.1.1. Type Field .........................................11
5.1.2. Reserved Field .....................................11
5.1.3. Checksum Field .....................................11
5.2. IP Header Fields ..........................................12
5.2.1. Source Address .....................................12
5.2.2. Destination Address ................................12
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