Cisco Catalyst 3550 Series User Manual

34-33
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-09
Chapter 34 Configuring IP Multicast Routing
Configuring Optional IGMP Features
You can determine the query interval by entering the show ip igmp interface interface-id privileged
EXEC command.
Beginning in privileged EXEC mode, follow these steps to change the IGMP query timeout:
To return to the default timeout value, use the no ip igmp query-timeout interface configuration
command.
Changing the Maximum Query Response Time for IGMPv2
If you are using IGMPv2, you can change the maximum query response time advertised in IGMP
queries. The maximum query response time allows the multilayer switch to quickly detect that there are
no more directly connected group members on a LAN. Decreasing the value allows the switch to prune
groups faster.
Beginning in privileged EXEC mode, follow these steps to change the maximum query response time:
To return to the default query-response time, use the no ip igmp query-max-response-time interface
configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface to be
configured.
Step 3
ip igmp querier-timeout seconds Specify the IGMP query timeout.
The default is 60 seconds (twice the query interval). The range is 60
to 300.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip igmp interface [interface-id] Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface to be
configured.
Step 3
ip igmp query-max-response-time
seconds
Change the maximum query response time advertised in IGMP queries.
The default is 10 seconds. The range is 1 to 25.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip igmp interface [interface-id] Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.

Cisco Catalyst 3550 Series Specifications

General

Form Factor	Rack-mountable
Manageable	Yes
RAM	64 MB
Device Type	Switch
MAC Address Table Size	12000 entries
Routing Protocol	RIP
Features	VLAN support
Power Supply	AC 120/230 V (50/60 Hz)
Ports	24 or 48 x 10/100Base-TX, 1 x GBIC, 2 x 10/100/1000Base-T
Operating Temperature	32 to 113°F (0 to 45°C)