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740 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
PIM Dense
25
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 show ip pim dense command at any level of the CLI.
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.
PowerConnect(config)#router pim
PowerConnect(config-pim-router)#graft-retransmit-timer 10
Syntax: graft-retransmit-timer <2 -10>
The default is 3 seconds.
Modifying inactivity timer
The router deletes a forwarding entry if the entry is not used to send multicast packets. The PIM
inactivity timer defines how long a forwarding entry can remain unused before the router deletes it.
To apply a PIM inactivity timer of 90 seconds to all PIM interfaces, enter the following.
PowerConnect(config)#router pim
PowerConnect(config-pim-router)#inactivity-timer 90
Syntax: inactivity-timer <10-3600>
The default is 180 seconds.
Selection of shortest path back to source
By default, when a multicast packet is received on a PIM-capable router interface in a multi-path
topology, the interface checks its IP routing table to determine the shortest path back to the
source. If the alternate paths have the same cost, the first alternate path in the table is picked as
the path back to the source. For example, in the table below, the first four routes have the same
cost back to the source. However, 137.80.127.3 will be chosen as the path to the source since it is
the first one on the list. The router rejects traffic from any port other than Port V11 on which
137.80.127.3 resides.
PowerConnect#show ip pim dense
Global PIM Dense Mode Settings
Hello interval: 60, Neighbor timeout: 180
Graft Retransmit interval: 10, Inactivity interval: 180
Route Expire interval: 200, Route Discard interval: 340
Prune age: 180, Prune wait: 3