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Chapter 44
Configuring IP Multicast Routing
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Default IGMP Configuration
Table 44-4
Table 44-4
Feature
Multilayer switch as a member of a multicast group
Access to multicast groups
IGMP version
IGMP host-query message interval
IGMP query timeout
IGMP maximum query response time
Multilayer switch as a statically connected member
Configuring the Switch as a Member of a Group
You can configure the switch as a member of a multicast group and discover multicast reachability in a
network. If all the multicast-capable routers and multilayer switches that you administer are members of
a multicast group, pinging that group causes all these devices to respond. The devices respond to ICMP
echo-request packets addressed to a group of which they are members. Another example is the multicast
trace-route tools provided in the software.
Performing this procedure might impact the CPU performance because the CPU will receive all data
Caution
traffic for the group address.
Beginning in privileged EXEC mode, follow these steps to configure the switch to be a member of a
group. This procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
ip igmp join-group group-address
OL-12247-04
Modifying the IGMP Host-Query Message Interval, page 44-41
Changing the IGMP Query Timeout for IGMPv2, page 44-42
Changing the Maximum Query Response Time for IGMPv2, page 44-43
Configuring the Switch as a Statically Connected Member, page 44-43
shows the default IGMP configuration.
Default IGMP Configuration
Purpose
Enter global configuration mode.
Specify the interface to be configured, and enter interface configuration
mode.
Configure the switch to join a multicast group.
By default, no group memberships are defined.
For group-address, specify the multicast IP address in dotted decimal
notation.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Configuring Optional IGMP Features
(optional)
(optional)
(optional)
(optional)
Default Setting
No group memberships are defined.
All groups are allowed on an interface.
Version 2 on all interfaces.
60 seconds on all interfaces.
60 seconds on all interfaces.
10 seconds on all interfaces.
Disabled.
44-39
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