Configuring The Aging Time - Cisco Catalyst 3550 series Software Configuration Manual

Displaying IGMP Snooping Information

Configuring the Aging Time

You can set the aging time for forwarding-table entries that the switch learns by using the IP
multicast-source-only learning method.
Beginning in privileged EXEC mode, follow these steps to configure the aging time:
Command
Step 1 configure terminal
Step 2
ip igmp snooping source-only learning age-timer
time
Step 3
end
Step 4 show running-config | include
source-only-learning
Step 5 copy running-config startup-config
To disable the aging of the forwarding table entries, enter the ip igmp snooping source-only-learning
age-timer 0 global configuration command.
Displaying IGMP Snooping Information
You can display IGMP snooping information for dynamically learned and statically configured router
ports and VLAN interfaces. You can also display MAC address multicast entries for a VLAN configured
for IGMP snooping.
To display IGMP snooping information, use one or more of the privileged EXEC commands in
Table
Table 20-4 Commands for Displaying IGMP Snooping Information
Command
show ip igmp snooping [vlan vlan-id]
show ip igmp snooping group [vlan vlan-id]
show ip igmp snooping mrouter [vlan vlan-id]
Catalyst 3550 Multilayer Switch Software Configuration Guide
20-12
20-4.
Purpose
Display the snooping configuration information for all VLANs on the
switch or for a specified VLAN.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Display information about the IGMP multicast groups, the compatibility
mode, and the ports that are associated with each group.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Display information on dynamically learned and manually configured
multicast router interfaces.
Note
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Chapter 20
Purpose
Enter global configuration mode
Set the aging time. The range is from 0 to 2880 seconds. The
default is 600 seconds (10 minutes).
Return to privileged EXEC mode.
Verify the aging time.
(Optional) Save your entries in the configuration file.
When you enable IGMP snooping, the switch automatically
learns the interface to which a multicast router is connected.
These are dynamically learned interfaces.
Configuring IGMP Snooping and MVR
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