# Monitoring ATM Subinterfaces for Layer 2 Services over MPLS

#### Purpose

Display the current state of all specified ATM subinterfaces.

#### Action

To display the current state of all ATM subinterfaces:

    host1#show atm subinterface
    Interface   ATM-Prot VCD VPI VCI Type Encap MTU  Status Address
    ----------- -------- --- --- --- ---- ----- ---- ------ -------
    ATM 2/0.100 ATM/MPLS 100   0 100 PVC  AAL0  9180 up     --
    ATM 2/0.101 ATM/MPLS 101   0 101 PVC  AAL5  9180 up     --
    ATM 2/0.200 RFC-1483 200   0 200 PVC  SNAP  9180 up     --
    ATM 2/0.201 RFC-1483 201   0 201 PVC  SNAP  9180 up     --
    4 interface(s) found

To display the current state of a specific ATM subinterface:

    host1#show atm subinterface atm 2/0.100
                                     Circuit                           Interface
    Interface   ATM-Prot VCD VPI VCI  Type   Encap MTU      Status       Type
    ---------   -------- --- --- --- ------- ----- ---- -------------- ---------
    ATM 2/0.100 ATM/MPLS 100   0 100 PVC     AAL0  9180 lowerLayerDown Static

    Maximum number of cells per packet: 100
    Cell aggregation timeout timer:     2

    SNMP trap link-status: disabled

    InPackets:                0
    InBytes:                  0
    OutPackets:               0
    OutBytes:                 0
    InErrors:                 0
    OutErrors:                0
    InPacketDiscards:         0
    InPacketsUnknownProtocol: 0
    OutDiscards:              0
    1 interface(s) found

#### Meaning

Table 104 lists the show atm subinterface command output fields; for a description of the other fields in this display, see Monitoring ATM in the JunosE Link Layer Configuration Guide.

Table 104: show atm subinterface Output Fields

Field Name | Field Description
--- | ---
Encap | Encapsulation type: AAL0—VCC cell relay–encapsulated circuits that receive raw ATM cells AAL5—ATM cross-connect interfaces
Maximum number of cells per packet | Maximum number of ATM cells that the router can concatenate in a single packet; if this value is not configured, “ Martini cell aggregation: disabled” appears instead of this field. Displayed for an individual ATM over MPLS interface with AAL0 encapsulation
Cell aggregation timeout timer | 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, “ Martini cell aggregation: disabled” appears instead of this field. Displayed for an individual ATM over MPLS interface with AAL0 encapsulation

| Note: For ATM over MPLS interfaces, the ATM-Prot field displays ATM/MPLS.

#### Related Documentation

- show atm subinterface