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 105 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 105: 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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