3Com SuperStack 4 Configuration Manual page 162

174 C 7: M
HAPTER ULTICAST
P
ROTOCOL
Enabling/Disabling IGMP Snooping
Use the commands in
enable IGMP Snooping globally in System View, and then enable IGMP Snooping
of the corresponding VLAN in VLAN View.
Perform the following configuration in System View and VLAN View.
Table 178 Enabling/Disabling IGMP Snooping
Operation
Enable/disable IGMP Snooping
Although layer 2 and layer 3 multicast protocols can run together, they cannot run
on the same VLAN or its corresponding VLAN interface at the same time. For
example, if the layer 2 multicast protocol is enabled on a VLAN, then the layer 3
multicast protocol cannot operate on this VLAN, and vice versa.
IGMP Snooping functions only when it is enabled both in System View and in
VLAN View.
By default, IGMP Snooping is disabled.
Configuring Router Port Aging Time
Use the commands in
If the switch has not received a general query message from the router before the
router port is aged, the switch will remove the port from the MAC multicast
group.
Perform the following configuration in system view.
Table 179 Configuring router port aging time
Operation
Configure router port aging time
Restore the default aging time
By default, the port aging time is 105 seconds.
Configuring Maximum Response Time
Use the commands in
time. If the Switch 5500G-EI receives no report message from a port within the
maximum response time, the switch will remove the port from the multicast
group.
Perform the following configuration in System View.
Table 180 Configuring the maximum response time
Operation
Configure the maximum
response time
Restore the default setting
By default, the maximum response time is 10 seconds.
Table 178 to enable/disable IGMP Snooping on Layer 2. First
Command
igmp-snooping { enable | disable }
Table 179 to manually configure the router port aging time.
Command
igmp-snooping router-aging-time
undo igmp-snooping router-aging-time
Table 180 to manually configure the maximum response
Command
igmp-snooping max-response-time
undo igmp-snooping max-response-time
seconds
seconds