Displaying the unicast FIB

Use the following procedure to display the unicast FIB.

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.

Procedure

  1. In the navigation pane, expand Configuration > IS-IS.
  2. Click SPBM.
  3. Click the Unicast FIB tab.

Unicast FIB field descriptions

Use the data in the following table to use the Unicast FIB tab.

Name

Description

SysId

Specifies the system ID of the node where the unicast FIB entry originated.

Vlan

Specifies the VLAN of the unicast FIB entry.

DestinationMacAddr

Specifies the destination MAC Address of the unicast FIB entry.

OutgoingPort

Specifies the outgoing port of the unicast FIB entry.

HostName

Specifies the host name of the node where unicast FIB entry originated.

Cost

Specifies the cost of the unicast FIB entry.