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Chapter 4

IP Multicast in a Data Center

IP Multicast Data Center Configuration

Deploy PIM Sparse-mode on the aggregation-layer switches and define the RPs as the previously configured campus core-layer switches.

Select Catalyst switches that have IGMP snooping and use CGMP in low-end switches that do not support IGMP snooping.

Use recommended commands to ensure that the correct RPs and sources are used.

Use “show” commands to ensure proper operation of the multicast configurations and enable SNMP traps to log multicast events.

If a firewall module (PIX) or CSM is used in the aggregation layer, then a VLAN that is terminated on the Layer 3 switch (aggregation layer) must be created for IP multicast traffic to bypass the firewall and CSM. Currently, the firewall and CSM do not support IP multicast forwarding. Once PIM is supported on the various services modules, then this step will not be necessary.

IP Multicast Data Center Configuration

The applications (MoH and IP/TV) used in this sample design (shown in Figure 4-2) have few sources to many receivers. The sources are located in the server farm. So, a complex distribution of RPs throughout the network is not required.

Figure 4-2

Data Center Design Reference Diagram

WAN Campus Core

Campus

6k-botleft-core

Core L3

Internet Edge

6k-botright-core

Aggregation layer switches

6k-agg left

6k-agg right

Dedicated multicast VLAN

Front-End layer switches

Data Center

VLAN 11

VLAN 10

IPTV server

CallManager with MoH

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Cisco AVVID Network Infrastructure IP Multicast Design

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