Step 4: Monitor Statistics for a Channelized Interface

Action

To monitor statistics for a channelized DS-3 to DS-0 interface or channelized DS-3 to DS-1 interface, use one of the following CLI operational mode commands:

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

user@host> monitor interfaces t1-fpc/pic/port:channel

Sample Output

The following sample output is for a channelized DS-3 to DS-0 interface:

user@host> monitor interface ds-2/1/0:5:1  

host                 Seconds: 9                   Time: 10:36:11

                                                               Delay: 0/0/4

Interface: ds-2/1/0:5:1, Enabled, Link is Up

Encapsulation: Cisco-HDLC, Keepalives, Speed: 64kbps

Traffic statistics:                                           Current delta

  Input bytes:                      52502 (80 bps)                    [262]

  Output bytes:                     52608 (88 bps)                    [344]

  Input packets:                      714 (0 pps)                       [4]

  Output packets:                     714 (0 pps)                       [5]

Encapsulation statistics:

  Input keepalives:                   133                               [1]

  Output keepalives:                  133                               [1]

Error statistics:

  Input errors:                         0                               [0]

  Input drops:                          0                               [0]

  Input framing errors:                 0                               [0]

  Input runts:                          0                               [0]

  Input giants:                         0                               [0]

  Policed discards:                   410                               [1]

  L3 incompletes:                       0                               [0]

  L2 channel errors:                    0                               [0]

  L2 mismatch timeouts:                 0                               [0]

  Carrier transitions:                  0                               [0]

  Output errors:                        0                               [0]

  Output drops:                         0                               [0]

  Aged packets:                         0Active alarms : N              [0]   

Next='n', Quit='q' or ESC, Freeze='f', Thaw='t', Clear='c', Interface='i'

The following sample output is for a channelized DS-3 to DS-1 interface:

user@host> monitor interface t1-2/1/0:19 

host                 Seconds: 4                   Time: 10:37:53

                                                               Delay: 0/0/4

Interface: t1-2/1/0:19, Enabled, Link is Up

Encapsulation: Cisco-HDLC, Keepalives, Speed: T1

Traffic statistics:                                           Current delta

  Input bytes:                   27046020 (124752 bps)              [32358]

  Output bytes:                 186975710 (623840 bps)             [161809]

  Input packets:                   233498 (139 pps)                   [289]

  Output packets:                  273161 (139 pps)                   [290]

Encapsulation statistics:

  Input keepalives:                   138                               [0]

  Output keepalives:                  141                               [0]

Error statistics:

  Input errors:                         0                               [0]

  Input drops:                          0                               [0]

  Input framing errors:                 0                               [0]

  Input runts:                          0                               [0]

  Input giants:                         0                               [0]

  Policed discards:                   439                               [0]

  L3 incompletes:                       0                               [0]

  L2 channel errors:                    0                               [0]

  L2 mismatch timeouts:                 0                               [0]

  Carrier transitions:                  0                               [0]

  Output errors:                        0                               [0]

  Output drops:                         0                               [0]

  Aged packets:                         0Active alarms : N              [0]   

Next='n', Quit='q' or ESC, Freeze='f', Thaw='t', Clear='c', Interface='i'

What It Means

This command checks for and displays 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.

Table 52 lists additional problem situations and actions to help you further understand an interface problem.

Table 52: Problem Situations and Actions

Problem Situation	Action
Framing errors are increasing.	Check the frame checksum sequence (FCS), scrambling, and subrate configuration.
Framing errors are increasing, and the configuration is correct.	Check the cabling to the router and have the carrier verify the integrity of the line.
Input errors are increasing.	Check the cabling to the router and have the carrier verify the integrity of the line.

NOTE: 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.