Multicast - AutoRP


In a [Multicast](/multicast) topology, when using a [mapping agent](/multicast-mapping-agent-and-rp-placement) with [Multicast PIM sparse mode](/multicast-pim-sparse-mode) and [Auto-RP](/multicast-autorp), the 224.0.1.39 multicast address is used by mapping agents to listen for candidate announcements.  It is therefore expected that this group appear in the multicast routing table of the mapping agent.

However, it may also appear on non-mapping-agent routers as well.  This is because whenever the `send-rp-discovery` command is applied to a multicast router, it sends out an [IGMP](/igmp) [membership report](/igmp-membership-report) for this group.  This means that directly connected neighbors of the mapping agent will also have this group in the multicast routing table.

## Links

https://forum.networklessons.com/t/multicast-pim-auto-rp/1339/52?u=lagapides

https://networklessons.com/cisco/ccie-enterprise-infrastructure/multicast-ip-pim-auto-rp

Multicast mapping agent IGMP membership report

Multicast - PIM Snooping

Multicast - PIM dense vs sparse mode

Multicast - PIM join message during register stop suppression timer

Multicast - PIM

Multicast - Routing Table Timers

Multicast - Source Specific Multicast (SSM)

Multicast - Sparse Mode register suppression timer

Multicast - Understanding global vs interface-level configuration

Multicast - Upstream and Downstream

Multicast - Using MSDP with Anycast PRs

Multicast - generating a routing table entry

Multicast - ip igmp join-group vs ip igmp static-group

Multicast - reading the multicast routing table

Multicast - route-map on IOS-XE 16.9.4

Multicast - routing over the Internet

Multicast - troubleshooting multicast routing

Multicast Anycast RP

Multicast Cisco Group Management Protocol

Multicast Dense Mode Prune Message Behavior on Shared Media

Multicast IGMPv3 include and exclude modes

Multicast IPv4 address space

Multicast MAC addresses

Multicast Manual RP Configuration in Small PIM Networks

Multicast Mapping Agent and RP placement

Multicast OIL IIF mroute table

Multicast PIM Assert and dense mode

Multicast PIM Auto RP and Mapping Agent single device

Multicast PIM Bidirectional mode traffic between sources and RPs

Multicast PIM Bootstrap (BSR) election

Multicast PIM Designated Router sparse mode

Multicast PIM dense mode

Multicast PIM neighbors are stateless

Multicast PIM send-rp-announce-scope

Multicast PIM sparse mode Rendezvous Point (RP)

Multicast PIM sparse mode

Multicast PIM sparse-dense mode

Multicast PIM what triggers an assert forwarder election

Multicast PIM with multiple RPs

Multicast PIM with multiple mapping-agents

Multicast PIM-assert forwarder election

Multicast SPT and RPT

Multicast bidirectional PIM advantages

Multicast boundary filtering - filter auto RP

Multicast enabling Bidir in BSR mode

Multicast ip pim autorp listener

Multicast ip pim rp-address override

Multicast load splitting across equal-cost paths

Multicast local subnetwork address range

Multicast mapping IP to MAC addresses

Multicast ping on a Nexus device

Multicast using Anycast RP with Auto-RP and BSR

Multicast

NAT - Translation Table

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Multicast mapping agent IGMP membership report

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