Extend LDP policies to mLDP

In addition to link LDP, a policy can be assigned to mLDP as an import policy. For example, if the following policy was assigned as an import policy to mLDP, any FEC arriving with an IP address of 100.0.1.21 is dropped.

*A:SwSim2>config>router>policy-options# info 
----------------------------------------------
            prefix-list "100.0.1.21/32"
                prefix 100.0.1.21/32 exact
            exit
            policy-statement "policy1"
                entry 10
                    from
                        prefix-list "100.0.1.21/32"
                    exit
                    action drop
                    exit
                exit
                entry 20
                exit
                default-action accept
                exit
            exit

The policy can be assigned to mLDP using the configure router ldp import-mcast-policy policy1 command. Based on this configuration, the prefix list matches the mLDP outer FEC and the action is executed.

The mLDP import policy is useful for enforcing root only functionality on a network. For a PE to be a root only, enable the mLDP import policy to drop any arriving FEC on the P router.