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.

Job Aid

The following section describes the fields in the output for the SPBM multicast FIB command.

show isis spbm multicast-fib

The following table describes the fields in the output for the show isis spbm multicast-fib command.


Parameter	Description
MCAST DA	Indicates the multicast destination MAC address of the multicast FIB entry.
ISID	Indicates the I-SID of the multicast FIB entry.
BVLAN	Indicates the B-VLAN of the multicast FIB entry.
SYSID	Indicates the system identifier of the multicast FIB entry.
HOST-NAME	Indicates the host name of the multicast FIB entry.
OUTGOING INTERFACE	Indicates the outgoing port of the multicast FIB entry.
INCOMING INTERFACE	Indicates the outgoing port of the multicast FIB entry.