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    Monitoring MPLS Forwarding for Layer 2 Services over MPLS

    Purpose

    Display configuration and statistics for all label-switched paths (LSPs) or for specific LSPs configured on the label-switching router (LSR). The brief keyword displays only the action taken for each in label.

    Action

    To display LSP configuration and statistics from the MPLS forwarding table:

    host1:two#show mpls forwarding
    serial4/1:1/1/1/1/1.1 to   222.9.1.3
      In  label 20
        0 pkts, 0 hcPkts, 0 octets
        0 hcOctets, 0 errors, 0 discardPkts
      Out label 45 on tun mpls:1 nbr 222.9.1.3
        0 pkts, 0 hcPkts, 0 octets
        0 hcOctets, 0 errors, 0 discardPkts

    To display summary information from the MPLS forwarding table:

    host:two# show mpls forwarding brief
    Platform label space
    In Label  Owner              Action
    -------- -------- ---------------------------------------------------------
    16       ldp      lookup on inner header/label
    17       ldp      swap to 29 on ATM5/0.1, nbr 10.10.11.5
    18       ldp      swap to 30 on ATM5/0.1, nbr 10.10.11.5
    19       ldp      swap to 32 on ATM5/0.1, nbr 10.10.11.5
    20       ldp      swap to 34 on ATM5/0.1, nbr 10.10.11.5
    21       ldp      lookup on inner header/label
    22       ldp      swap to 38 on ATM5/0.1, nbr 10.10.11.5
    23       ldp      swap to 40 on ATM5/0.1, nbr 10.10.11.5
    24       ldp      swap to 42 on ATM5/0.1, nbr 10.10.11.5
    25       ldp      lookup on inner header/label
    26       ldp      swap to 46 on ATM5/0.1, nbr 10.10.11.5
    27       ldp      swap to 48 on ATM5/0.1, nbr 10.10.11.5
    52       ldp      l2transport to FastEthernet2/0.2                  
    53       ldp      l2transport to FastEthernet2/0.1 
    L2transport
         Interface        Owner                 Action
    -------------------- -------- -------------------------------------------
    FastEthernet2/0.1    ldp      swap to 55, push 42 on ATM5/0.1, nbr 10.10.11.5
    FastEthernet2/0.2    ldp      swap to 54, push 42 on ATM5/0.1, nbr 10.10.11.5
    

    The “swap to” labels 55 and 54 under the L2transport heading in the summary example are VC labels received from the other router. The label that is pushed in this case, 42, is for the base tunnel.

    Meaning

    Table 1 lists the show mpls forwarding command output fields.

    Table 1: show mpls forwarding Output Fields

    Field Name

    Field Description

    name/id

    Interface specifier

    destination

    Destination IP address

    In label

    Label sent to upstream neighbor for route

    Out label

    Label received from downstream neighbor for route

    pkts

    Number of packets sent across tunnel

    hcPkts

    Number of high-capacity (64-bit) packets sent across tunnel

    octets

    Number of octets sent across tunnel

    hcOctets

    Number of high-capacity (64-bit) octets sent across tunnel

    errors

    Number of packets dropped for some reason before being sent

    discardPkts

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

     

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    Published: 2014-08-18