322 CHAPTER 18: MULTICAST PROTOCOL
Configuration
Example—Enable IGMP
Snooping
Networking Requirements
To implement IGMP Snooping on the switch, first enable it. The switch is connected
to the router via the router port, and with user PCs through the non-router ports on
vlan 10.
Networking Diagram
Figure83 IGMP Snooping configuration network
Configuration Procedure
Enable IGMP Snooping globally.
[SW5500]igmp-snooping enable
Enable IGMP Snooping on VLAN 10.
[SW5500]vlan 10
[SW5500-vlan10]igmp-snooping enable
IGMP Snooping Fault
Diagnosis and
Troubleshooting
Fault: Multicast function cannot be implemented on the switch.
Troubleshooting:
Diagnosis 1: IGMP Snooping is disabled.
1Input the display current-configuration command to display the status of IGMP
Snooping.
2If the switch disabled IGMP Snooping, check whether the IGMP Snooping is enabled
globally and also enabled on the VLAN. If IGMP Snooping is not enabled globally, first
input the igmp-snooping enable command in System View and then input the
igmp-snooping enable command in VLAN view. If IGMP Snooping is not enabled on
the VLAN, input the igmp-snooping enable command in VLAN view.
Diagnosis 2: Multicast forwarding table set up by IGMP Snooping is wrong.
1Input the display igmp-snooping group command to display if the multicast group
is the expected one.
2If the multicast group created by IGMP Snooping is not correct, refer to Technical
Support for assistance.
3Continue with diagnosis 3 if step 2 is completed.
Internet
Multicast
Switch
Router