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The default is 105 seconds. The range is 3 to 65535 seconds.
Modifying hello timer
This parameter defines the interval at which periodic hellos are sent out PIM interfaces. Devices use
hello messages to inform neighboring devices of their presence. The interval can be set between 10
and 3600 seconds, and the default rate is 30 seconds.
To apply a PIM hello timer of 120 seconds to all ports on the device operating with PIM, enter the
following.
Device(config)# router pim
Device(config-pim-router)# hello-timer 120
Syntax: [no] hello-timer 10-3600
The default is 30 seconds.
Modifying prune timer
This parameter defines how long a PIM device will maintain a prune state for a forwarding entry.
The first received multicast interface is forwarded to all other PIM interfaces on the device. If there is no
presence of groups on that interface, the leaf node sends a prune message upstream and stores a
prune state. This prune state travels up the tree and installs a prune state.
A prune state is maintained until the prune timer expires or a graft message is received for the
forwarding entry. The default value is 180 seconds.
To set the PIM prune timer to 90, enter the following.
Device(config)# router pim
Device(config-pim-router)# prune-timer 90
Syntax: [no] prune-timer seconds
The default is 180 seconds. The range is 60 to 3600 seconds.
Modifying the prune wait timer
The prune-wait command allows you to configure the amount of time a PIM device will wait before
stopping traffic to neighbor devices that do not want the traffic. The value can be from zero to 30
seconds. The default is three seconds. A smaller prune wait value reduces flooding of unwanted traffic.
A prune wait value of zero causes the PIM device to stop traffic immediately upon receiving a prune
message. If there are two or more neighbors on the physical port, then the prune-wait command
should not be used because one neighbor may send a prune message while the other sends a join
message at the same time, or within less than three seconds.
To set the prune wait time to zero, enter the following commands.
Device(config)#router pim
Device(config-pim-router)#prune-wait 0
Syntax: [no] prune-wait seconds
The seconds can be 0 - 30. A value of 0 causes the PIM device to stop traffic immediately upon
receiving a prune message. The default is 3 seconds.
To view the currently configured prune wait time, enter the show ip pim dense command as described
in the Displaying basic PIM Dense configuration information” section.
IPv4 Multicast Protocols
FastIron Ethernet Switch IP Multicast Configuration Guide 87
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