Note
IPv6 IS-IS accept policies for DvR are not supported.
When you configure DvR in an SPB network, you can leverage IS-IS accept policies to control the DvR routes learned from the DvR backbone. The DvR backbone contains the master list of all the host routes learned from various DvR domains.
You can configure accept policies on a DvR Controller or a non-DvR BEB as a filter to determine which DvR host routes to accept into the routing table, from the DvR backbone. Accept policies apply to only those backbone (or inter-domain) host routes that are not part of the Controller's own DvR enabled subnets and do not have the same domain ID as that of the Controller.
For non-DvR BEBs, all the routes present in the backbone are learned, but you can still use the accept policies to filter specific routes.
For information on DvR, see Distributed Virtual Routing.