show mpls forwarding-table

Step 1 Enter the show mpls forwarding-table command to display the discovered neighbors.

8540-P# show mpls forwarding-table

Local Outgoing Prefix Bytes tag Outgoing Next Hop

tag tag or VC or Tunnel Id switched interface

16 Untagged 100.1.0.0/16 0 AT9/0/0 4.4.4.2

17 Untagged 11.0.0.0/8 0 AT9/0/0 4.4.4.2

18 Untagged 200.1.0.0/16 0 AT9/0/1 6.6.6.2

19 Pop tag 222.2.1.1/32 624 Fa11/0/0 111.0.1.1

20 Pop tag 222.2.1.2/32 0 Fa11/0/1 111.0.1.18

The Local tag field displays the label assigned by this switch router.

The Outgoing tag or VC field displays the label assigned by the next hop, or VPI/VCI used to get to the next hop.

• [T]—Means forwarding through a TSP tunnel.
• Untagged—Means there is no label for the destination from the next hop, or label switching is not enabled on the outgoing interface.
• Pop tag—Means that the next hop advertised an implicit NULL label for the destination, and that this router deleted the top label from the stack.
• Aggregate—Means directly connected VRF routes.

Step 2 Check the Prefix or Tunnel Id field. It should displays the address (Loopback 0 interface IP address) or tunnel to which packets with this label are going. If it does not, check the interface configuration.

The Bytes tag switched field displays the number of bytes switched with this incoming label.

Step 3 Check the Outgoing interface field. It should display the correct interface configured to the next hop on either side of the switch router.

Step 4 Check the Next Hop field. It should display the correct IP address to the next hop interface.