PurposeCommand or Action
Returns to privileged EXEC mode.end
Example:
Device(config-igmp-profile)# end
Step 8
Verifies your entries.
show ip igmp interface [interface-id]
Example:
Device# show ip igmp interface
Step 9
Related Topics
Example: Controlling Access to Multicast Groups, on page 81
Modifying the IGMP Host-Query Message Interval (CLI)
The device periodically sends IGMP host-query messages to discover which multicast groups are present on
attached networks. These messages are sent to the all-hosts multicast group (224.0.0.1) with a time-to-live
(TTL) of 1. The device sends host-query messages to refresh its knowledge of memberships present on the
network. If, after some number of queries, the software discovers that no local hosts are members of a multicast
group, the software stops forwarding multicast packets to the local network from remote origins for that group
and sends a prune message upstream toward the source.
The device elects a PIM designated router (DR) for the LAN (subnet). The DR is the router or multilayer
device with the highest IP address for IGMPv2. For IGMPv1, the DR is elected according to the multicast
routing protocol that runs on the LAN. The designated router is responsible for sending IGMP host-query
messages to all hosts on the LAN. In sparse mode, the designated router also sends PIM register and PIM join
messages toward the RP router.
This procedure is optional.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface interface-id
4.
ip igmp query-interval seconds
5.
end
6.
show ip igmp interface [interface-id]
7.
copy running-config startup-config
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
38 OL-29890-01
Configuring IGMP
Modifying the IGMP Host-Query Message Interval (CLI)
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