Enabling PIM Sparse Mode
You can configure PIM interfaces to operate in sparse, dense, or sparse-dense mode. Sparse mode is the default. There is no need to explicitly configure sparse mode on a PIM interface, but this is often done for clarity or when you configure a change from dense to sparse mode.
To explicitly configure PIM to operate in sparse mode on an interface, include the mode sparse statement:
mode sparse;
For a list of the hierarchy levels at which you can include this statement, see the statement summary section for this statement.
