Modifying the PIM Router-Query Message Interval
PIM routers and multilayer switches send PIM router-query messages to find which device will be the
designated router (DR) for each LAN segment (subnet). The DR is responsible for sending IGMP host-query
messages to all hosts on the directly connected LAN.
With PIM DM operation, the DR has meaning only if IGMPv1 is in use. IGMPv1 does not have an IGMP
querier election process, so the elected DR functions as the IGMP querier. With PIM-SM operation, the DR
is the device that is directly connected to the multicast source. It sends PIM register messages to notify the
RP that multicast traffic from a source needs to be forwarded down the shared tree. In this case, the DR is the
device with the highest IP address.
This procedure is optional.
SUMMARY STEPS
1.
configure terminal
2.
interface interface-id
3.
ip pim query-interval seconds
4.
end
5.
show ip igmp interface [interface-id]
6.
copy running-config startup-config
DETAILED STEPS
PurposeCommand or Action
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
Specifies the interface to be configured, and enters interface
configuration mode.
interface interface-id
Example:
Switch(config)# interface
Step 2
gigabitethernet 1/0/1
Configures the frequency at which the switch sends PIM
router-query messages.
ip pim query-interval seconds
Example:
Switch(config-if)# ip pim
Step 3
The default is 30 seconds. The range is 1 to 65535.
To return to the default setting, use the no ip pim
query-interval [seconds] interface configuration
command.
Note
query-interval 45
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
68 OL-29426-01
Configuring PIM
Modifying the PIM Router-Query Message Interval
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