Configuring RPF Policies

You configure one or more multicast RPF policies to disable RPF checks for a particular multicast (S,G) pair. You usually disable RPF checks on egress routing devices of a point-to-multipoint LSP.

An RPF policy behaves like an import policy. If no policy term matches the input packet, the default action is to accept (that is, to perform the RPF check).

Note: Be careful when disabling RPF checks on multicast traffic. If you disable RPF checks in some configurations, multicast loops can result.

To configure multicast RPF policies, include the rpf-check-policy statement with a correctly configured policy:

For a list of the hierarchy levels at which you can include this statement, see the statement summary section for this statement.

Changes to an RPF check policy take effect immediately:

• If no policy was previously configured, the policy takes effect immediately.
• If the policy name is changed, the new policy takes effect immediately and any packets no longer filtered are subjected to the RPF check.
• If the policy is deleted, all packets formerly filtered are subjected to the RPF check.
• If the underlying policy is changed, but retains the same name, the new conditions take effect immediately and any packets no longer filtered are subjected to the RPF check.