Command Line Interface
1148 1553-KDU 137 365 Uen D 2006-06-16
Default Setting
no limit
Command Mode
Global Configuration
Command Usage
• The default path for packets from a multicast source to a receiver is
through the RP. However, the path through the RP is not always the
shortest path. Therefore, the router uses the RP to forward only the first
packet from a new multicast group to its receivers. Afterwards, it
calculates the shortest path tree (SPT) directly between the receiver
and source, and then uses the SPT to send all subsequent packets from
the source to the receiver instead of using the shared tree.
•The ip pim spt-threshold infinity command forces the router
to use the shared tree for all multicast groups, or just for the specified
multicast groups.
Example
This example prevents the ECN330-switch from using the SPT for multicast
groups 224.1.0.0~224.1.255.255 .
Console(config)#ip pim spt-threshold infinity 224.1.0.0 255.255.0.0
Console(config)#exit
Console#show ip pim
PIM-DM Admin Status: Disabled
PIM-SM Admin Status: Enabled
Join/Prune-Interval: 60
Register-Suppression: 60
Register-Rate-Limit: 500
Register-CheckSum-with Data: Disabled
Ignore RP-Set-Priority: Disabled
CRP-Prefix: Disabled
SPT-Threshold: Enabled
SPT-Threshold Group: 224.1.0.0
SPT-Threshold Group mask: 255.255.0.0
Console#
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