ISID filters are a type of MAC filters that allows filtering based on the ISID values instead of Layer 2 criteria used by MAC filters of type normal or vid. ISID filters can be deployed on iVPLS PBB SAPs and Epipe PBB SAPs in the following scenarios:
The MMRP usage of the MRP policy ensures automatically that traffic using Group B-MAC is not flooded between domains. However, there could be small transitory periods when traffic originated from PBB BEB with unicast B-MAC destination may be flooded in the BVPLS context as unknown unicast in the BVPLS context for both IVPLS and PBB Epipe. To restrict distribution of this traffic for local PBB services, ISID filters can be deployed. The MAC filter configured with ISID match criterion can be applied to the same interconnect endpoints (BVPLS SAP or PW) as the MRP policy to restrict the egress transmission of any type of frames that contains a local ISID. The ISID filters are applied as required on a per B-SAP or B-PW basis, only in the egress direction.
The ISID match criteria are exclusive with any other criteria under mac-filter. A new mac-filter type attribute is defined to control the use of ISID match criteria and must be set to ISID to allow the use of ISID match criteria.