View Remote Unicast FIB

In SPBM, the IS-IS link-state database carries the BMAC addresses. To do this, SPBM supports an IS-IS TLV that advertises the I-SID and BMAC information across the network. Each node has a System ID, which also serves as Backbone MAC address (BMAC) of the switch. These Backbone MAC addresses are populated into the SPBM VLAN Forwarding Information Base (FIB).

When the system discovers a network topology and stores it in the IS-IS link-state database, each node calculates shortest path trees for each source node, so that a unicast path now exists from every node to every other node. With this information, each node populates unicast information that it receives from SPBM into the FIB for forwarding purposes.