Display the Multicast FIB

About this task

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

When the network topology is discovered and stored 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 received from SPBM into the FIB for forwarding purposes.

The multicast FIB is not produced until virtual services are configured and learned.

Procedure

Enter Privileged EXEC mode:

enable
Display the SPBM multicast FIB:

show isis spbm multicast-fib [vlan <1-4059>] [i-sid <1–16777215>] [nick-name <x.xx.xx>] [summary]

Example

Switch#show isis spbm multicast-fib

==========================================================================================
                                  SPBM MULTICAST FIB ENTRY INFO
==========================================================================================
MCAST DA          ISID     BVLAN SYSID          HOST-NAME OUTGOING-INTERFACES  INCOMING
                                                                               INTERFACE
------------------------------------------------------------------------------------------
03:00:07:e4:e2:02 15000066 1001  0077.0077.0077 Switch-25    1/33              MLT-2
03:00:08:e4:e2:02 15000066 1001  0088.0088.0088 Switch-33    1/50,1/33         40.40.40.40
03:00:41:00:04:4d 1101     4058  00bb.0000.4100 Switch-1(*)  1/3,1/49,0.0.0.0  Tunnel_to_HQ
03:00:41:00:04:4f 1103     4058  00bb.0000.4100 Switch-1(*)  1/3,1/49,0.0.0.0  cpp
------------------------------------------------------------------------------------------
Total number of SPBM MULTICAST FIB entries 4
------------------------------------------------------------------------------------------

Variable Definitions

The following table defines parameters for the show isis spbm multicast-fib command.


Variable	Value
vlan `<1-4059>`	Displays the FIB for the specified SPBM VLAN.
i-sid `<1–16777215>`	Displays the FIB for the specified I-SID.
nick-name `<x.xx.xx>`	Displays the FIB for the specified nickname.
summary	Displays a summary of the FIB.