Step 4: Monitor Statistics for a Channelized OC-12 Interface

Action

To monitor statistics for a Channelized OC-12 interface, use the following JUNOS CLI operational mode command:

user@host> monitor interfaces t3-fpc/pic/port:channel 

Sample Output

user@host> monitor interfaces t3-0/3/0:11

host                     Seconds: 12                  Time: 17:27:15

                                                             Delay: 32/0/32

Interface: t3-0/3/0:11, Enabled, Link is Down

Encapsulation: Cisco-HDLC, Keepalives, Speed: T3

Traffic statistics:                                           Current delta

  Input bytes:                     109846 (176 bps)                    [44]

  Output bytes:                    110308 (176 bps)                    [44]

  Input packets:                     1687 (1 pps)                       [2]

  Output packets:                    1693 (1 pps)                       [2]

Encapsulation statistics:

  Input keepalives:                     8                               [2]

  Output keepalives:                    7                               [2]

Error statistics:

  Input errors:                         0                               [0]

  Input drops:                          0                               [0]

  Input framing errors:              1066                               [0]

  Input runts:                          0                               [0]

  Input giants:                         0                               [0]

  Policed discards:                     0                               [0]

  L3 incompletes:                       0                               [0]

  L2 channel errors:                    3                               [0]

  L2 mismatch timeouts:                 0                               [0]

  Carrier transitions:                  7                               [0]

  Output errors:                        0  Output drops:                [0]   

Interface warnings:

  o Loopback detected while not in test mode

What It Means

The sample output shows common interface failures, indicates whether loopback is detected, and shows increases in framing errors. Use information from this command to help narrow down possible causes of an interface problem.

NOTE: If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

CAUTION: We recommend that you use this command only for diagnostic purposes. Do not leave it on during normal router operations because real-time monitoring of traffic consumes additional CPU and memory resources.