# Monitoring MPLS Layer 2 Interfaces for Layer 2 Services over MPLS

#### Purpose

Display status and configuration information about MPLS layer 2 major, minor, and shim interfaces. Both the show mpls interface shim command and the show mpls l2transport interface command provide the same output. The shim keyword displays all shim interfaces. The brief keyword displays only limited interface information.

#### Action

To display information about MPLS layer 2 interfaces:

    host1#show mpls interface shim
    MPLS shim interface FastEthernet2/0
      Remote PE address is 10.9.1.3
      Virtual circuit ID is 1
      Group ID is 0 by default
      Control word is not preferred by default
      Don't send sequence numbers by default
      Relay format is ethernet by default
      ATM VPI/VCI range is 1-2/100-109 (up on the line card)
      ATM VPI/VCI range is 5-10/200-300 (up on the line card)
      ATM cell aggregation is enabled
      ATM cell aggregation maximum cells per packet is 20
      ATM cell aggregation timeout timerId is 2
      Administrative state is enabled
      Operational state is down (shim interface does not have a next-hop)
      Operational MTU is 1500
      Received:
        0 packets
        0 bytes
        1 error
        0 discards
      Sent:
        0 packets
        0 bytes
        0 errors
        0 discards
    received mtu 0

    queue 0: traffic class best-effort, bound to ethernet FastEthernet2/0
        Queue length 0 bytes
        Forwarded packets 0, bytes 0
        Dropped committed packets 0, bytes 0
        Dropped conformed packets 0, bytes 0
        Dropped exceeded packets 0, bytes 0

    MPLS policy input shimRl
        classifier-group *
          0 packets, 0 bytes
          rate-limit-profile shimRl
            committed: 0 packets, 0 bytes
            conformed: 0 packets, 0 bytes
            exceeded:  0 packets, 0 bytes
      MPLS policy output shimRl
        classifier-group *
          0 packets, 0 bytes
          rate-limit-profile shimRl
            committed: 0 packets, 0 bytes
            conformed: 0 packets, 0 bytes
            exceeded:  0 packets, 0 bytes

This excerpt from the command output shows the label information displayed when a circuit is up

    host1#show mpls l2transport interface
    ...
      Out Label 49 on  tun mpls:lsp-de090100-24-37
        0 pkts, 0 hcPkts, 0 octets
        0 hcOctets, 0 errors, 0 discardPkts
        queue 0: traffic class best-effort, bound to atm-vc ATM1/0.1
          Queue length 0 bytes
          Forwarded packets 0, bytes 0
          Dropped committed packets 0, bytes 0
          Dropped conformed packets 0, bytes 0
          Dropped exceeded packets 0, bytes 0
    ...

To display summary information about MPLS shim interfaces:

    host1#show mpls interface shim brief
                        Remote-PE   Virtual     Load
                           or       Circuit   Balancing    Admin    Oper
        Interface       LSP-name      ID        Group      state    state
    -----------------   ---------   -------   ---------   -------   -----
    FastEthernet2/0.1   222.9.1.3   200001    -           enabled   up
    FastEthernet2/0.2   222.9.1.3   200002    -           enabled   up

#### Meaning

Table 107 lists the show mpls interface and show mpls l2transport interface command output fields

Table 107: show mpls interface and show mpls l2transport interface Output Fields

Field Name | Field Description
--- | ---
MPLS shim interface | Interface specifier
Remote PE address | Address of the remote PE router for the layer 2 circuit
Virtual circuit ID | VC ID number for the interface
Group ID | Group ID number for the interface
Control word | Configuration of the control word
Sequence number | Statement regarding configuration of sequence number
Relay format | Configuration of relay format
ATM VPI/VCI range | Starting and ending (inclusive) virtual path identifiers and virtual circuit identifiers of the reserved VC range and whether the range specification is activated on the line module for transportation of ATM cells that belong to multiple VCs over a single pseudowire.
ATM cell aggregation | Concatenation of multiple ATM cells to be sent in a single MPLS-labeled packet for an ATM port, enabled or disabled.
ATM cell aggregation maximum cells per packet | Maximum number of ATM cells that the router can concatenate in a single packet; if this value is not configured, "ATM cell aggregation: disabled" appears instead of this field. Displayed for an ATM port (ATM AAL5 over ATM major interface).
ATM cell aggregation timeout timerID | Identifier (1, 2, or 3) of the ATM Martini cell packing timer that detects timeout of the cell collection threshold; if this value is not configured, "ATM cell aggregation: disabled" appears instead of this field. Displayed for an ATM port (ATM AAL5 over ATM major interface).
Administrative state | Administrative state, enabled or disabled
Operational state | Statement regarding operational state of interface
Operational MTU | Maximum transmission unit for the interface
Received, Sent | Statistics for MPLS traffic received or sent on the interface
packets | Number of packets received or sent
bytes | Number of bytes received or sent
error | Number of packets that are dropped for some reason at receipt or before being sent
discards | Number of packets that are discarded because of lack of buffer space at receipt or before being sent
received mtu | MTU specified in received packets
queue, traffic class, bound to | Queue and traffic class bound to the specified interface
Queue length | Number of bytes in the queue
Forwarded packets, bytes | Total number of packets and bytes forwarded by this interface
Dropped committed packets, bytes | Total number of committed packets and bytes dropped by this interface
Dropped conformed packets, bytes | Total number of conformed packets and bytes dropped by this interface
Dropped exceeded packets, bytes | Total number of exceeded packets and bytes dropped by this interface
MPLS policy | Type (input, output) and name of policy
classifier-group entry | Entry index
packets, bytes | Number of packets and bytes on the interface
rate-limit-profile | Name of profile
Committed | Number of packets and bytes that conform to the committed access rate
Conformed | Number of packets and bytes that exceed the committed access rate but conform to the peak access rate
Exceeded | Number of packets and bytes that exceed the peak access rate
In label | VC label sent by this router to upstream neighbor for route
Out label | VC label received by this router from downstream neighbor for route
MPLS statistics | MPLS statistics for traffic received or sent
pkts | Number of packets received or sent
hcPkts | Number of high-capacity (64-bit) packets received or sent
octets | Number of octets received or sent
hcOctets | Number of high-capacity (64-bit) octets received or sent
errors | Number of packets that are dropped for some reason at receipt or before being sent
discardPkts | Number of packets that are discarded because of lack of buffer space at receipt or before being sent
Interface | Interface specifier
Remote-PE or LSP-name | IP address of the remote PE router or name of the tunnel
Virtual Circuit ID | VC ID number for the interface
Load Balancing Group | Load-balancing group associated with the layer 2 Martini transport circuit
Admin state | Administrative state of the interface, enabled or disabled
Oper state | Operational state of the interface, up or down

#### Related Documentation

- show mpls interface
- show mpls l2transport interface