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# Switching to an SPT for PIM Sparse Mode

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.)

ip pim spt-threshold

- Use to specify when PIM sparse mode switches from a shared tree to an SPT.
- Specify a nonzero integer or the keyword infinity to prevent PIM sparse mode from switching to an SPT.
- Specify a value of 0 (default) to configure PIM to switch to an SPT when a source starts sending multicast messages.
- Example
  `
  host1(config)#ip pim spt-threshold 4
  `
- Use the no version to restore the default value, 0.
- See ip pim spt-threshold.

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