Dell PowerConnect B-FCXs, Configuration Manual

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780 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
IP multicast protocols and IGMP snooping on the same device
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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
Vl a n A
Vl a n B
(with VE)
“ip pim”
Interf a ce s
Client 1
Client 2
Server 1
Server 2
PIM
Forw a rding
“m u ltic as t a ctive” Vl a n
IGMP Snooping
PIM-DM
Neighbor
Device
(DUT)
Phy s ic a l
port