Switching to an SPT for PIM Sparse Mode for IPv4

PIM sparse mode initiates multicasting using a shared tree. You can configure PIM sparse mode to switch to an SPT when a source starts sending multicast messages, or you can prevent PIM sparse mode from switching to an SPT. Multicasting over an SPT might be more efficient than multicasting over a shared tree. (See PIM Sparse Mode.)

To specify the network configuration that PIM sparse mode uses when a source starts sending multicast messages:

• Issue the ip pim spt-threshold command in Global Configuration mode.
  host1(config)#ip pim spt-threshold

  The no version restores the default value, 0.

Note: You can configure PIM on IPv4 and IPv6 interfaces. However, IPv6 does not support all PIM configuration options. For information about configuring PIM on IPv6 interfaces, see Configuring PIM for IPv6 Multicast.

Related Documentation

• Understanding PIM for IPv4 Multicast
• Monitoring PIM for IPv4 Multicast
• ip pim spt-threshold