User's Manual

Configuration Guide of XGS-5240-Series
42-18
SwitchA(config)#ip igmp snooping
SwitchA(config)#ip igmp snooping vlan 60
SwitchA(config)#ip igmp snooping vlan 60 L2-general-querier
SwitchB#config
SwitchB(config)#ip igmp snooping
SwitchB(config)#ip igmp snooping vlan 100
SwitchB(config)#ip igmp snooping vlan 100 mrouter interface ethernet 1/0/1
Multicast Configuration
The same as scenario 1
IGMP Snooping listening result:
Similar to scenario 1
Scenario 3: To run in cooperation with layer 3 multicast protocols.
SWITCH which is used in Scenario 1 is replaced with ROUTER with specific configurati
ons remains the same. And multicast and IGMP snooping configurations are the same
with what it is in Scenario 1. To configure PIM-SM on ROUTER, and enable PIM-SM o
n vlan 100 (use the same PIM mode with the connected multicast router)
Configurations are listed as below:
switch#config
switch(config)#ip pim multicast-routing
switch(config)#interface vlan 100
switch(config-if-vlan100)#ip pim sparse-mode
IGMP snooping does not distribute entries when layer 3 multicast protocol is enabled. It
only does the following tasks.
 Remove the layer 2 multicast entries.
 Provide query functions to the layer 3 with vlan, S, and G as the parameters.
 When layer 3 IGMP is disabled, re-enable distributing layer 2 multicast entries.
By looking up the layer 3 IPMC entries, it can be found that ports can be indicated by
the layer 3 multicast entries. This ensures the IGMP snooping can work in cooperation
with the layer 3 multicast protocols.
42.3.4 IGMP Snooping Troubleshooting
On IGMP Snooping function configuration and usage, IGMP Snooping might not ru