Monitoring MPLS Forwarding Table for VPWS

Purpose

Display information about MPLS labels that are being used for forwarding. The brief keyword displays summary information for the MPLS labels.

Action

To display MPLS forwarding information for a particular label:

host1#show mpls forwarding label 17
In label: 17
  Label space: platform label space
  Owner: bgp
  Spoof check: router ERX-pe
  Action: 
    MPLS next-hop: 28, l2transport to ATM2/0.100
  Statistics:
    0 in pkts
    0 in Octets
    0 in errors
    0 in discard pkts

To display brief information about MPLS forwarding for all labels:

host1:pe1# show mpls forwarding brief


In Label  Owner                              Action                            
-------- -------- -------------------------------------------------------------
17       bgp      l2transport to ATM2/0.100                                    
18       bgp      l2transport to ATM2/0.12 
26       ldp      lookup on inner header/label                                 
27       ldp      swap to 39 on ATM2/0.20, nbr 20.20.20.2                      
28       ldp      swap to 41 on ATM2/0.20, nbr 20.20.20.2                      
29       ldp      lookup on inner header/label                                 
30       ldp      swap to 43 on ATM2/0.20, nbr 20.20.20.2                      
31       ldp      swap to 44 on ATM2/0.20, nbr 20.20.20.2                      
46       ldp      swap to 40 on ATM2/0.20, nbr 20.20.20.2                      
L2transport


     Interface    Owner                        Action                      
--------------- -------- -----------------------------------------
ATM2/0.12       bgp       swap to 801028, push 39 on ATM2/0.20, nbr 20.20.20.2                                              
ATM2/0.100      bgp      swap to 801024, push 39 on ATM2/0.20, nbr 20.20.20.2  

To display MPLS forwarding information for a particular interface:

host1:pe#show mpls forwarding interface atm2/0.100
In label: n/a, ATM2/0.100
  Owner: bgp
  Spoof check: router erx-pe
  Action: 
    MPLS next-hop: 27, label 801024, resolved by MPLS next-hop 8
      MPLS next-hop: 8, resolved by MPLS next-hop 9, peer 10.3.2.2
        MPLS next-hop: 9, label 39 on ATM2/0.20, nbr 10.20.20.2
  Statistics: Disabled

Meaning

Table 143 lists the show mpls forwarding command output fields.

Table 143: show mpls forwarding Output Fields

Field Name

Field Description

In label

Label sent to upstream neighbor for route

Out label

Label received from downstream neighbor for route

Label space

Label space in which the label is assigned

Owner

Signaling protocol that placed the label in the forwarding table: BGP, LDP, or RSVP-TE

Spoof check

Type and location of spoof checking performed on the MPLS packet, router, or interface

Action

Action taken for MPLS packets arriving with that label

in pkts

Number of packets sent with the label

in Octets

Number of octets sent with the label

in errors

Number of packets that are dropped for some reason before being sent

in discardPkts

Number of packets that are discarded due to lack of buffer space before being sent

Interface

Layer 2 interface that is a member of an L2VPN

Related Documentation