Configuring IP Multicast Protocols
December 2005 © Foundry Networks, Inc. 19 - 11
Syntax: hello-timer <10-3600>
The default is 60 seconds.
Modifying Prune Timer
This parameter defines how long a Foundry PIM router will maintain a prune state for a forwarding entry.
The first received multicast interface is forwarded to all other PIM interfaces on the router. 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:
FastIron SuperX Router(config)# router pim
FastIron SuperX Router(config-pim-router)# prune-timer 90
Syntax: prune-timer <10-3600>
The default is 180 seconds.
Modifying the Prune Wait Timer
The CLI command prune-wait allows you to configure the amount of time a PIM router will wait before stopping
traffic to neighbor routers that do not want the traffic. The value can be from zero to three 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 router 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 during time or in less than
three seconds.
To set the prune wait time to zero, enter the following commands:
FastIron SuperX Router(config)# router pim
FastIron SuperX Router(config-pim-router)# prune-wait 0
Syntax: prune-wait <time>
where <time> can be 0 - 3 seconds. A value of 0 causes the PIM router to stop traffic immediately upon receiving
a prune message. The default is 3 seconds.
Viewing the Prune Wait Time
To view the prune wait time, enter the following command at any level of the CLI:
FastIron SuperX Router(config)#show ip pim dense
Global PIM Dense Mode Settings
Hello interval: 60, Neighbor timeout: 180
Graft Retransmit interval: 180, Inactivity interval: 180
Route Expire interval: 200, Route Discard interval: 340
Prune age: 180, Prune wait: 3
Modifying Graft Retransmit Timer
The Graft Retransmit Timer defines the interval between the transmission of graft messages.
A graft message is sent by a router to cancel a prune state. When a router receives a graft message, the router
responds with a Graft Ack (acknowledge) message. If this Graft Ack message is lost, the router that sent the graft
message will resend it.
To change the graft retransmit timer from the default of 180 to 90 seconds, enter the following:
FastIron SuperX Router(config)# router pim
FastIron SuperX Router(config-pim-router)# graft-retransmit-timer 90
Syntax: graft-retransmit-timer <10-3600>
To Next Page
Loading...
Need help?
General
