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Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter46 Configuring IP Multicast Routing
Configuring IP Multicast Routing
Switch(config)# interface vlan100
Switch(config-if)# ip pim passive
Switch(config-if)# exit
Switch(config)# interface GigabitEthernet3/0/20
Switch(config-if)# ip pim passive
Switch(config-if)# exit
Switch(config)# interface vlan100
Switch(config-if)# ip address 100.1.1.1 255.255.255.0
Switch(config-if)# ip pim passive
Switch(config-if)# exit
Switch(config)# interface GigabitEthernet3/0/20
Switch(config-if)# no switchport
Switch(config-if)# ip address 10.1.1.1 255.255.255.0
Switch(config-if)# ip pim passive
Switch(config-if)# end
To verify that PIM stub is enabled for each interface, use the show ip pim interface privileged EXEC
command:
Switch# show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
3.1.1.2 GigabitEthernet3/0/25 v2/SD 1 30 1 3.1.1.2
100.1.1.1 Vlan100 v2/P 0 30 1 100.1.1.1
10.1.1.1 GigabitEthernet3/0/20 v2/P 0 30 1 10.1.1.1
Use these privileged EXEC commands to display information about PIM stub configuration and status:
•show ip pim interface displays the PIM stub that is enabled on each interface.
•show ip igmp detail displays the interested clients that have joined the specific multicast source
group.
•show ip igmp mroute verifies that the multicast stream forwards from the source to the interested
clients.
Configuring a Rendezvous Point
You must have an RP if the interface is in sparse-dense mode and if you want to treat the group as a sparse
group. You can use several methods:
•Manually Assigning an RP to Multicast Groups, page46-24
•Configuring Auto-RP, page46-26 (a standalone, Cisco-proprietary protocol separate from PIMv1)
•Configuring PIMv2 BSR, page46-30 (a standards track protocol in the Internet Engineering Task
Force (IETF)
You can use auto-RP, BSR, or a combination of both, depending on the PIM version that you are running
and the types of routers in your network. For more information, see the “PIMv1 and PIMv2
Interoperability” section on page46-11 and the “Auto-RP and BSR Configuration Guidelines” section
on page 46-12.

Manually Assigning an RP to Multicast Groups

This section explains how to manually configure an RP. If the RP for a group is learned through a
dynamic mechanism (such as auto-RP or BSR), you need not perform this task for that RP.