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Chapter 2

IP Multicast in a Campus Network

Summary

Distribution-Layer Switch Configuration

The following example shows the multicast configuration for “6k-b1-dist-left.”

ip multicast-routing ! interface Vlanxx

description VLANs for Access Layer VLANs ip address 10.1.x.x 255.255.255.0 ip pim sparse-mode ! interface Vlanxx

description VLANs for other L3 links to Core ip address 10.0.0.x 255.255.255.252 ip pim sparse-mode ! ip pim rp-address 10.6.2.1 ! ip pim spt-threshold infinity ! Identifies the RP addresses for this device pointing to the Anycast RP address in the core layer. Reduces multicast state (S,G) from the leaf routers by keeping traffic on the shared tree. (Optional)

The following example shows the multicast configuration for “6k-b1-dist-right.”

ip multicast-routing ! interface Vlanxx

description VLANs for Access Layer VLANs ip address 10.1.x.x 255.255.255.0 ip pim sparse-mode ! interface Vlanxx

description VLANs for other L3 links to Core ip address 10.0.0.x 255.255.255.252 ip pim sparse-mode ! ip pim rp-address 10.6.2.1 ! ip pim spt-threshold infinity ! Identifies the RP addresses for this device pointing to the Anycast RP address in the core layer. Reduces multicast state (S,G) from the leaf routers by keeping traffic on the shared tree. (Optional)

Summary

In summary, when using IP multicast with MoH or IP/TV in the campus follow these recommendations. Use PIM-SM (recommended) Ensure that the DR is configured to be the HSRP Active router (recommended) Use Anycast RP (recommended) Keep RP placement simple (recommended)

Cisco AVVID Network Infrastructure IP Multicast Design

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