Modifying The Pim Router-Query Message Interval - Cisco Catalyst 2960-XR Configuration Manuals

Modifying the PIM Router-Query Message Interval

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
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 pim query-interval seconds
Example:
Switch(config-if)# ip pim
query-interval 45
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
68
Purpose
Enters the global configuration mode.
Specifies the interface to be configured, and enters interface
configuration mode.
Configures the frequency at which the switch sends PIM
router-query messages.
The default is 30 seconds. The range is 1 to 65535.
Note To return to the default setting, use the no ip pim
query-interval [seconds] interface configuration
command.
Configuring PIM
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