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Configuring Source Specific Multicast
SSM Configuration Examples
IPC-468
Cisco IOS IP Configuration Guide
SSM Configuration Examples
This section provides the following SSM configuration examples:
• SSM with IGMPv3 Example
• SSM with IGMP v3lite and URD Example
• SSM Filtering Example
SSM with IGMPv3 Example
The following example shows how to configure a router (running IGMPv3) for SSM:
ip multicast-routing
!
interface Ethernet3/1
ip address 172.21.200.203 255.255.255.0
description backbone interface
ip pim sparse-dense-mode
!
interface Ethernet3/2
ip address 131.108.1.2 255.255.255.0
ip pim sparse-dense-mode
description ethernet connected to hosts
ip igmp version 3
!
ip pim ssm default
SSM with IGMP v3lite and URD Example
The following example shows how to configure IGMP v3lite and URD on interfaces connected to hosts
for SSM. Configuring IGMP v3lite and URD is not required or recommended on backbone interfaces.
interface ethernet 3/1
ip address 172.21.200.203 255.255.255.0
ip pim sparse-dense-mode
description ethernet connected to hosts
!
interface ethernet 1
description ethernet connected to hosts
ip address 131.108.1.2 255.255.255.0
ip pim sparse-dense-mode
ip urd
ip igmp v3lite
SSM Filtering Example
The following example shows how to configure filtering on a legacy RP router running Cisco IOS
releases earlier than Release 12.1(3)T for SSM routing. This filtering will suppress all unwanted
PIM-SM and MSDP traffic in the SSM range. Without this filtering, SSM will still operate, but there
may be additional RPT traffic if legacy first hop and last hop routers exist in the network.
ip access-list extended no-ssm-range
deny ip any 232.0.0.0 0.255.255.255 ! SSM range
permit ip any any
! Deny registering in SSM range