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Chapter 2

IP Multicast in a Campus Network

IP Multicast Medium Campus Design

Because the access-layer switches are Layer 2 switches, they will display Layer 2 Multicast address information instead of Layer 3 IP multicast addresses. The two key group addresses listed are:

    • 0100.5

      e00.0127—RP announcement address of 224.0.1.39

    • 0100.5

      e00.0128—Mapping agent discovery address of 224.0.1.40

Note

For recommendations and configurations for securing the network from unauthorized sources and RPs, see Chapter 8, “Security, Timers, and Traffic Engineering in IP Multicast Networks.”.

IP Multicast Medium Campus Design

This section provides a sample design for IP multicast in a medium campus network.

Note

Unlike the small campus design, which used collapsed distribution and core layer, the medium campus network has a distinct distribution and core layer. The IP addressing, VLAN numbering, and HSRP numbering conventions are the same as those used in the small campus design.

For IP multicast in a medium campus (shown in Figure 2-6): Use IGMP snooping or CGMP enabled access switches.

Enable PIM-SM on the distribution layer switches with their RPs defined as the Anycast RP address of the core switches.

Reduce multicast state (S,G) from the leaf routers by keeping traffic on the shared tree. (Optional) Place the RPs in the core layer switches running PIM-SM and Anycast RP.

Cisco AVVID Network Infrastructure IP Multicast Design

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