PurposeCommand or Action
Verifies your entries.
show ip igmp interface [interface-id]
Example:
Device# show ip igmp interface
Step 6
(Optional) Saves your entries in the configuration file.copy running-config startup-config
Example:
Device# copy running-config startup-config
Step 7
Related Topics
IGMP Versions, on page 34
Restrictions for Configuring IGMP, on page 32
Restrictions for IGMP Snooping, on page 33
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 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. With IGMPv2, the DR is the router or
multilayer device with the highest IP address. With IGMPv1, the DR is elected according to the multicast
routing protocol that runs on the LAN.
This procedure is optional.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 51
Configuring IGMP
Modifying the IGMP Host-Query Message Interval (CLI)
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