Static ISIDs are advertised between using the SPBM Service Identifier and Unicast Address sub-TLV in IS-IS when there is no ISID policy. This TLV advertises the local B-MAC and one or more ISIDs. The B-MAC used is the source-bmac of the Control/User VPLS. Typically remote B-MACs (the ultimate source-bmac) and the associated ISIDs are configured as static under the SPBM interface. This allows all remote B-MACs and all remote ISIDs to be configured one time per interface.