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780 PowerConnect B-Series FCX Configuration Guide

53-1002266-01

IP multicast protocols and IGMP snooping on the same device

25

If there are two sources for a single group, where one source sends traffic into a VLAN with IGMP

snooping enabled, while the other source sends traffic to a PIM enabled Layer 3 interface, a client

for the group in the same VLAN as the first source will only receive traffic from that source. It will

not receive traffic from the second source connected to the Layer 3 interface. Similarly, if there is

another IP interface with a Layer 3 client or PIM/DVMRP neighbor that requests traffic for the same

group, it will only receive traffic from the second source and not the first.

Configuration example

Figure 124 and Figure 125 show an example IGMP snooping and PIM forwarding configuration.

FIGURE 124 Example 1: IGMP Snooping and PIM forwarding

Vlan A

Vlan B

(with VE)

“ip pim”

Interfaces

Client 1

Client 2

Server 1

Server 2

PIM

Forwarding

“multicast active” Vlan

I

GMP Snooping

PIM-DM

Neighbor

Device

(DUT)

Physical

port