Cisco Catalyst 2960-XR Configuration Manuals page 33
Ip multicast routing
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Also See for Catalyst 2960-XR:
- Security configuration manual (404 pages) ,
- Configuration manual (196 pages) ,
- Reference (52 pages)
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Understanding Cisco's Implementation of IP Multicast Routing
(TTL) of 1. The switch 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 switch elects a PIM designated router (DR) for the LAN (subnet). The DR is the router or multilayer
switch 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. configure terminal
2. interface interface-id
3. ip igmp query-interval seconds
4. end
5. show ip igmp interface [interface-id]
6. copy running-config startup-config
DETAILED STEPS
Command or Action
Step 1
configure terminal
Example:
Switch# configure terminal
Step 2
interface interface-id
Example:
Switch(config)# interface
gigabitethernet 1/0/1
Step 3
ip igmp query-interval seconds
Example:
Switch(config-if)# ip igmp
query-interval 75
OL-29426-01
Enters the global configuration mode.
Specifies the interface on which you want to enable multicast
routing, and enters interface configuration mode.
Configures the frequency at which the designated router sends
IGMP host-query messages.
By default, the designated router sends IGMP host-query
messages every 60 seconds to keep the IGMP overhead very low
on hosts and networks.
The range is 1 to 18000.
Note
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
Modifying the IGMP Host-Query Message Interval
Purpose
To return to the default setting, use the no ip igmp
query-interval interface configuration command.
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