Verifying an ISDN BRI Interface

Purpose

Verify that the ISDN BRI interface is correctly configured.

Action

From the CLI, enter the show interfaces extensive command. Alternatively, from the J-Web interface select Monitor>Interfaces>br-6/0/0.

Sample Output

Physical interface: br-6/0/0, Enabled, Physical link is Up
  Interface index: 143, SNMP ifIndex: 59, Generation: 24
  Type: BRI, Link-level type: Controller, MTU: 4092, Clocking: 1, Speed: 144kbps, 
  Parent: None
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps Internal: 0x4000
  Link type      : Full-Duplex
  Link flags     : None
  Physical info  : S/T
  Hold-times     : Up 0 ms, Down 0 ms
  Last flapped   : 2005-12-07 12:21:11 UTC (04:07:26 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :                    0                    0 bps
   Input  packets:                    0                    0 pps
   Output packets:                    0                    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: 0, Errors: 0, Drops: 0, MTU errors: 0, Resource errors: 0

Meaning

The output shows a summary of 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).
• 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 likely 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.

Related Topics

For a complete description of show interfaces (ISDN BRI) output, see the JUNOS Interfaces Command Reference.