Redundancy For Multicast Traffic - Cisco 7604 Configuration Manual

Ios software configuration guide

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Configuring IPv4 Bidirectional PIM

Redundancy for Multicast Traffic

Redundancy for multicast traffic requires the following conditions:

For additional information (including configuration examples and troubleshooting information), see the

documents listed on this page:

http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

Unicast routing protocol such as OSPF or EIGRP

PIM uses RPF checks on the unicast routing table to determine the proper paths for multicast data

to traverse. If a unicast routing path changes, PIM relies upon the unicast routing protocol (OSPF)

to properly converge, so that the RPF checks used by PIM continue to work and show valid unicast

paths to and from the source IP address of the server sourcing the multicast stream.

PIM configured on all related Layer 3 interfaces

The unicast routing table is used to do path selection for PIM. PIM uses RPF checks to ultimately

determine the shortest path tree (SPT) between the client (receiver VLAN) and the source (multicast

VLAN). Therefore, the objective of PIM is to find the shortest unicast path between the receiver

subnet and the source subnet. You do not need to configure anything else for multicast when the

unicast routing protocol is working as expected and PIM is configured on all the Layer 3 links

associated with the unicast routing protocol.

Configuring IPv4 Multicast Layer 3 Switching

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