Cisco IOS Cookbook, 2nd Edition

Showing Multicast Status

Problem

You want to view the current status of multicast protocols on your router.

Solution

There are several useful commands for checking the status of multicast configuration and protocols. You can see what multicast routes pass through a router with the EXEC command:

Router#show ip mroute

There are two useful variants of this command. The first reports on forwarding statistics for each multicast group:

Router#show ip mroute count

And the second reports only on the groups that are currently active:

Router#show ip mroute active

You can look at statistics on group membership using the command:

Router#show ip igmp groups

Use the interface keyword to look at the IGMP information in more detail:

Router#show ip igmp interface

There are four useful commands for viewing PIM information. The first shows information about PIM neighbor relationships:

Router#show ip pim neighbor

The second command shows information about the PIM configuration on different interfaces:

Router#show ip pim interface

This command shows information about PIM-SM Rendezvous Points (RP):

Router#show ip pim rp

And, finally, if you are using the Bootstrap Router (PIM Version 2) technique for distributing RP information, you will want to use this command:

Router#show ip pim bsr-router PIMv2 Bootstrap information This system is the Bootstrap Router (BSR) BSR address: 172.17.254.5 (?) Uptime: 00:06:37, BSR Priority: 0, Hash mask length: 1 Next bootstrap message in 00:00:22 Next Cand_RP_advertisement in 00:00:15 RP: ...