SPBM Unicast FIB

Unicast FIB

The unicast computation runs a single Dijkstra (unlike all pair Dijkstras for multicast). SPBM produces only one Shortest Path First (SPF) tree and the tree is rooted on the computing node.

The unicast computation generates an entry for each node in the network. The Destination Address (DA) for that entry is the system-id of the node. In addition, if a node advertises MAC addresses other than the system-id, each MAC address has an entry in the unicast FIB table, and the shortest path to that MAC should be exactly the same as the path to the node.

Unicast FIB entries are installed to the vlan-fdb table.

The following text shows an example of the unicast FIB.

Switch:1# show isis spbm unicast-fib
==================================================================================================
                          SPBM UNICAST FIB ENTRY INFO
==================================================================================================
DESTINATION          BVLAN SYSID          HOST-NAME    OUTGOING       COST   AREA    AREA-NAME
ADDRESS                                                INTERFACE
--------------------------------------------------------------------------------------------------
00:16:ca:23:73:df   1000  0016.ca23.73df  SPBM-1      1/21            10     HOME    area-9.00.02
00:16:ca:23:73:df   2000  0016.ca23.73df  SPBM-1      1/21            10     HOME    area-9.00.02  
00:18:b0:bb:b3:df   1000  0018.b0bb.b3df  SPBM-2      MLT-2           10     HOME    area-9.00.02    
00:14:c7:e1:33:e0   1000  0018.b0bb.b3df  SPBM-2      MLT-2           10     HOME    area-9.00.02    
00:18:b0:bb:b3:df   2000  0018.b0bb.b3df  SPBM-2      MLT-2           10     HOME    area-9.00.02    

--------------------------------------------------------------------------------------------------
Home:   Total number of SPBM UNICAST FIB entries 5
Remote: Total number of SPBM UNICAST FIB entries 0
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