You can create an IS-IS accept policy for incoming routes for the Global Routing Table (GRT), which accepts routes into the routing table, or for a Virtual Routing and Forwarding (VRF) instance, which accepts incoming routes to the routing table of the VRF.
If you create an IS-IS accept policy on the switch for either the GRT or a VRF that operates at a global default level, the accept policy applies to all routes for all BEBs in the GRT or VRF.
If you create an IS-IS accept policy on the switch for a specific advertising BEB for either the GRT or a VRF, the IS-IS accept policy instance applies for that specific advertising BEB. If you use a more specific filter, the system gives preference to the specific filter over the global default level.