Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 43)

Multi-Service IronWare Multicast Configuration Guide 31
53-1003032-02
PIM Dense
1
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.
Brocade(config)#router pim
Brocade(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
“Displaying basic PIM Dense configuration information” .
Modifying graft retransmit timer
The graft retransmit timer defines the interval between the transmission of graft messages.
A graft message is sent by a device to cancel a prune state. When a device receives a graft
message, the device responds with a Graft Ack (acknowledge) message. If this Graft Ack message
is lost, the device 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.
Brocade(config)# router pim
Brocade(config-pim-router)# graft-retransmit-timer 90
Syntax: [no] graft-retransmit-timer seconds
The default is 180 seconds. The range is from 60-3600 seconds.
Modifying inactivity timer
The device 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 device deletes it.
To apply a PIM inactivity timer of 90 seconds to all PIM interfaces, enter the following.
Brocade(config)# router pim
Brocade(config-pim-router)# inactivity-timer 90
Syntax: [no] inactivity-timer seconds
The default is 180 seconds. The range is from 10-3600 seconds.
Selection of shortest path back to source
By default, when a multicast packet is received on a PIM-capable 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 following example, the first four routes have the same cost back
to the source. However, 137.80.127.3 is chosen as the path to the source since it is the first one on
the list. The device rejects traffic from any port other than Port V11 on which 137.80.127.3 resides