Troubleshooting Igmp Snooping Configuration; Switch Fails In Layer 2 Multicast Forwarding - HP 4800G Series Configuration Manual

[SwitchB] vlan 100
[SwitchB-vlan100] port gigabitethernet 1/0/1 to gigabitethernet 1/0/4
# Enable IGMP Snooping and the function of dropping unknown multicast traffic in VLAN 100.
[SwitchB-vlan100] igmp-snooping enable
[SwitchB-vlan100] igmp-snooping drop-unknown
[SwitchB-vlan100] quit
Configurations on Switch C and Switch D are similar to the configuration on Switch B.
3) Verify the configuration
After the IGMP Snooping querier starts to work, all the switches but the querier can receive IGMP
general queries. By using the display igmp-snooping statistics command, you can view the statistics
information about the IGMP messages received. For example:
# View the IGMP message statistics on Switch B.
[SwitchB] display igmp-snooping statistics
Received IGMP general queries:3.
Received IGMPv1 reports:0.
Received IGMPv2 reports:12.
Received IGMP leaves:0.
Received IGMPv2 specific queries:0.
Sent IGMPv2 specific queries:0.
Received IGMPv3 reports:0.
Received IGMPv3 reports with right and wrong records:0.
Received IGMPv3 specific queries:0.
Received IGMPv3 specific sg queries:0.
Sent IGMPv3 specific queries:0.
Sent IGMPv3 specific sg queries:0.
Received error IGMP messages:0.

Troubleshooting IGMP Snooping Configuration

Switch Fails in Layer 2 Multicast Forwarding

Symptom
A switch fails to implement Layer 2 multicast forwarding.
Analysis
IGMP Snooping is not enabled.
Solution
1) Enter the display current-configuration command to view the running status of IGMP Snooping.
2) If IGMP Snooping is not enabled, use the igmp-snooping command to enable IGMP Snooping
globally, and then use igmp-snooping enable command to enable IGMP Snooping in VLAN view.
3) If IGMP Snooping is disabled only for the corresponding VLAN, just use the igmp-snooping
enable command in VLAN view to enable IGMP Snooping in the corresponding VLAN.
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