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    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 1 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 1: 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.

     

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    Published: 2014-08-18