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Chapter 2

IP Multicast in a Campus Network

Campus Deployment

Model

CGMP Server

EtherSwitch Module

No

2950

No

3524-PWR

No

3550

Yes

4006/4500-SupIII/IV

Yes

6500-SupI/II

No-Switch, Yes - MSFC

Table 2-1

Non-RPF Traffic

Support for IGMP Snooping and/or CGMP

CGMP Client

IGMP Snooping

No

Yes

No

Yes

Yes

No

No

Yes

Yes

Yes

No

Yes

A router drops any multicast traffic received on a non-reverse path forwarding (non-RPF) interface. If there are two routers for a subnet, the DR will forward the traffic to the subnet and the non-DR will receive that traffic on its own VLAN interface. This will not be its shortest path back to the source and so the traffic will fail the RPF check. How non-RPF traffic is handled depends on the Catalyst switch platform and the version of software running (as shown in Figure 2-2).

Figure 2-2

Handling of Non-RPF Traffic

2

3

Multicast traffic received on a non-reverse path forwarding (non-RPF) interface is dropped

interfaces connecting the same two routers, the non-RPF traffic that hits the non-DRs CPU is amplified "N" times the source rate

1

The DR will forward the traffic from the source to the receivers on the outgoing interfaces

Non-RPF interface

VLAN 51

Non-DR

Designated Router

VLAN 50

M CallManager with MoH

87104

Cisco AVVID Network Infrastructure IP Multicast Design

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