When static ISIDs are defined the default is to advertise the static ISIDs when the interface parent (SAP or SDP) is up.
If the advertisement is not needed, an ISID policy can be created to prevent advertising the ISID.
use-def-mcast
If a policy is defined with use-def-mcast the local MFIB does not contain an Multicast MAC based on the PBB OUI+ ISID and the frame is flooded out the local tree. This applies to any node where the policy is defined. On other nodes if the ISID is advertised the ISID uses the MFIB for that ISID.
no advertise-local
If a policy of no advertise-local is defined in the ISIDs, the policy is not advertised. This combination should be used everywhere there is an I-VPLS with the ISID or where the Static ISID is defined to prevent black holes. If an ISID is to be moved from advertising to no advertising it is advisable to use use-def-mcast on all the nodes for that ISID which allows the MFIB to not be installed and starts using the default multicast tree at each node with that policy. Then the no advertise-local option can be used.
Each Policy may be used alone or in combination.