Checking D-Channel Interface Statistics

Purpose

Verify that the ISDN D-channel interface is operating properly. For ISDN PRI, verify that the D-channel interface is configured correctly.

Action

From the CLI, enter the show interfaces extensive command. Alternatively, from the J-Web interface select Monitor>Interfaces>dc-0/0/4.

Sample Output

user@host> show interfaces dc-0/0/4
extensive

Physical interface: dc-0/0/4, Enabled, Physical link is Up
  Interface index: 144, SNMP ifIndex: 60, Generation: 25
  Type: Serial, Link-level type: 55, MTU: 4092, Clocking: Internal, Speed: 16kbps,
  Parent: br-0/0/4 Interface index 143
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link type      : Full-Duplex
  Link flags     : None
  Physical info  : Unspecified
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: Unspecified, Hardware address: Unspecified
  Alternate link address: Unspecified
  Last flapped   : 2005-12-07 12:21:12 UTC (05:46:00 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                13407                    0 bps
   Output bytes  :                16889                    0 bps
   Input  packets:                 3262                    0 pps
   Output packets:                 3262                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 0, 
    Resource errors: 0
  Output errors:
    Carrier transitions: 1, Errors: 0, Drops: 0, MTU errors: 0, Resource errors: 0
  ISDN  alarms   : None
  ISDN media:            Seconds        Count  State
    LOF                       0            1  0K
    LOS                       0            0  0K

  Logical interface dc-0/0/4.32767 (Index 70) (SNMP ifIndex 72) (Generation 8)
    Flags: Point-To-Point SNMP-Traps Encapsulation: 60
    Traffic statistics:
     Input  bytes  :                13407
     Output bytes  :                82129
     Input  packets:                 3262
     Output packets:                 3262
    Local statistics:
     Input  bytes  :                13407
     Output bytes  :                82129
     Input  packets:                 3262
     Output packets:                 3262

Meaning

The output shows a summary of D-channel interface information. Verify the following information:

The physical interface is Enabled. If the interface is shown as Disabled, do either of the following:
- In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
- In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
The physical link is Up. A link state of Down indicates a problem with the interface module, interface port, or physical connection (link-layer errors).
For ISDN BRI, the Parent interface is a br-pim/0/port interface—br-0/0/4 in this example. For ISDN PRI, the Parent interface is a channelized T1 or channelized E1 interface—ct1–pim/0/port or ce1–pim/0/port.
The Last Flapped time is an expected value. The Last Flapped time indicates the last time the physical interface became unavailable and then available again. Unexpected flapping indicates possible link-layer errors.
The traffic statistics reflect expected input and output rates. Verify that the number of inbound and outbound bytes and packets matches expected throughput for the physical interface. To clear the statistics and see only new changes, use the clear interfaces statistics interface-name command.

Checking D-Channel Interface Statistics

Purpose

Action

Sample Output

Meaning

Related Topics