# Monitoring Interfaces

From User Exec mode, use the following show commands to monitor and display the T3 interface, T1 interface, and HDLC serial data channel information:

- Monitor channelized T3 interfaces on a slot and port.
  host1#show controllers t3 0/1
- Monitor a T1 interface.
  host1#show controllers t3 0/1:1
- Monitor fractional T1 subchannels.
  host1#show controllers t3 ft1
- Monitor the state of the serial interface or a slot/port.
  host1#show controllers t3 serial 0/1

## Setting a Baseline

You can set a statistics baseline for serial interfaces, subinterfaces, and/or circuits using the baseline interface serial command. Use the delta keyword with the show commands to display statistics with the baseline subtracted.

## Displaying Counters and Time Intervals

Counters and time intervals are MIB statistics, which are defined in the following specifications:

- RFC 2495—Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types (January 1999)
- RFC 2496—Definitions of Managed Objects for the DS3/E3 Interface Types (January 1999)

The show controllers t3 slot/port all command displays the following information:

- T3 current interval counters—Counters for the current interval
- T3 last interval counters—Counters for the previous interval
- T3 24-hour total counters—Cumulative counters for the last 24 hours or since the interface was started
- The last 24 hours of 15-minute reporting intervals (96 intervals)

The show controllers t3 slot/port: channel all command displays the following information:

- T1 current interval counters—Counters for the current interval
- T1 last interval counters—Counters for the previous interval
- T1 24-hour total counters—Cumulative counters for the last 24 hours or since the interface was started
- The last 24 hours of 15-minute reporting intervals (96 intervals)

## Output Filtering

You can use the output filtering feature of the show command to include or exclude lines of output based on a text string you specify. See Command Line Interface in JunosE System Basics Configuration Guide, for details.

baseline interface serial

- Use to set a statistics baseline for serial interfaces.
- The router implements the baseline by reading and storing the statistics at the time the baseline is set and subtracting this baseline whenever baseline-relative statistics are retrieved.
- Use the optional delta keyword with the show interfaces serial commands to view the baseline statistics.
- Example
  host1#baseline interface serial 2/0:1/1
- There is no no version.
- See baseline interface.

show controllers t1

show controllers t3

- Use to display data and MIB statistics for a T3 interface or a T1 channel.
- Use the brief keyword to display the administrative and operational status of all configured T3 interfaces, or to display abbreviated information for the specified T3 interface.
- For definitions of the MIB statistics for a T3 interface, see RFC 2496—Definitions of Managed Objects for the DS3/E3 Interface Types (January 1999).
- For definitions of the MIB statistics for a T1 channel, see RFC 2495—Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types (January 1999).
- Field descriptions for T3 interface (T1 channel not specified)
  - Description—Text description or alias if configured for the interface
  - ifAdminStatus—One of the following administrative states of the interface:
    - ifAdminUp—Interface is administratively enabled
    - ifAdminDown—Interface is administratively disabled
    - ifAdminTesting—Interface is administratively configured in a testing state
  - snmp trap link-status—Status of SNMP trapping (enabled or disabled)
  - alarms detected—One of the following T3 alarms:
    - No alarm present—No alarms present on the line
    - Rcv RAI Failure—Remote device is sending a far end alarm failure
    - Xmt RAI Failure—Local device is sending a far end alarm failure
    - Rcv AIS—Remote device is sending an alarm indication signal (AIS)
    - Xmt AIS—Local device is sending an AIS
    - Rcv LOF—Loss of one or more frames from the remote end
    - Rcv LOS—Loss of signal at the local end
    - Undefined line status—Indicates that the line is in an undefined state

      | Note: The alarms detected field does not appear for interfaces that you disabled in the software.

  - framing—Type of framing format
  - line code—Type of line code format
  - clock source—Type of clock source
  - cable length—Cable length, in feet
  - Loopback—State of loopback for the controller: enabled or disabled. If loopback is enabled, one of the following states is displayed:
    - Diagnostic—Loops the data back toward the router and sends an AIS toward the network
    - Payload—Loops the data toward the network after the framer has processed the data
    - Line—Loops the data toward the network before the data reaches the framer
  - MDL Transmit Path—Status of path transmission: active or not active
  - MDL Transmit Test-Signal—Status of test signal: active or not active
  - MDL Transmit Idle-Signal—Status of idle signal: active or not active
  - Equipment Identification Code—eic string for MDL
  - Line Identification Code—lic string for MDL
  - Frame Identification Code—fic string for MDL
  - Unit Identification Code—unit string for MDL
  - Facility Identification Code—pfi string for MDL
  - Port Code—port string for MDL
  - Generator Number—generator string for MDL
  - BERT test—Number of current test and total number of tests
    - Test interval—Length of the BERT test
    - status—Sync (controller is synchronized with remote device) or NoSync (controller is not synchronized with remote device)
    - Sync count—Number of times the pattern detector synchronized with the incoming data pattern
    - Received bit count—Number of bits received
    - Error bit count—Number of bits with errors
  - Number of valid intervals—Number of 15-minute intervals since the line module was last powered on or reset
  - Time elapse in current interval—Reported in 15-second intervals
  - P-bit errored seconds—Number of errored seconds encountered by a T3 in the current interval
  - P-bit severely errored seconds—Number of severely errored seconds encountered by a T3 in the current interval
  - Severely errored frame seconds—Number of severely errored framing seconds encountered by a T3 in the current interval
  - Unavailable seconds—Number of unavailable seconds encountered by a T3 in the current interval
  - Line code violations—Number of line code violations encountered by a T3 in the current interval
  - P-bit coding violations—Number of coding violations encountered by a T3 in the current interval
  - Line errored seconds—Number of line errored seconds encountered by a T3 in the current interval
  - C-bit coding violations—Number of C-bit coding violations encountered by a T3 in the current interval
  - C-bit errored seconds—Number of C-bit errored seconds encountered by a T3 in the current interval
  - C-bit severely errored seconds—Number of C-bit severely errored seconds encountered by a T3 in the current interval
- Example 1—In this example, a T3 interface is specified.

      host1#show controllers t3 2/0

      DS3 2/0
      Description: toronto ct3 interface
      ifAdminStatus = ifAdminDown
      snmp trap link-status = enabled
      No alarms detected
      Framing is C-BIT, Line Code is B3ZS, Clock Source is Line
      Cable Length is 0 ft
      Loopback Disabled
      MDL Transmit Path is not active
      MDL Transmit Test-Signal is active
      MDL Transmit Idle-Signal is not active
      Equipment Identification Code is ERX-1400
      Line Identification Code is Bldg 10
      Frame Identification Code is null string
      Unit Identification Code is 080001
      Facility Identification Code is Site 25
      Port Code is Port 0800
      Generator Number is null string
      Number of valid interval - 96
      Time elapse in current interval - 861
      Ds3 Current Interval Counters
      P-bit errored seconds          = 0
      P-bit severely errored seconds = 0
      Severely errored frame seconds = 0
      Unavailable seconds            = 0
      Line code violations           = 0
      P-bit coding violations        = 0
      Line errored seconds           = 0
      C-bit coding violations        = 0
      C-bit errored seconds          = 0
      C-bit severely errored seconds = 0
      Ds3 Last Interval Counters
      P-bit errored seconds          = 0
      P-bit severely errored seconds = 0
      Severely errored frame seconds = 0
      Unavailable seconds            = 0
      Line code violations           = 0
      P-bit coding violations        = 0
      Line errored seconds           = 0
      C-bit coding violations        = 0
      C-bit errored seconds          = 0
      C-bit severely errored seconds = 0
      Ds3 24 Hour Total Counters
      P-bit errored seconds          = 0
      P-bit severely errored seconds = 0
      Severely errored frame seconds = 0
      Unavailable seconds            = 0
      Line code violations           = 0
      P-bit coding violations        = 0
      Line errored seconds           = 0
      C-bit coding violations        = 0
      C-bit errored seconds          = 0
      C-bit severely errored seconds = 0

- Example 2—In this example, the brief keyword is specified.

      host1#show controllers t3 brief

      Interfaces                  ifAdminStatus   OperationalStatus
      5/0(channelized)                up             up
      5/1(channelized)                up             up
      5/2(channelized)                up             down
      5/3(channelized)                down           down
      5/4(channelized)                down           down
      5/5(channelized)                down           down
      5/6(channelized)                down           down
      5/7(channelized)                down           down
      5/8(channelized)                down           down
      5/9(channelized)                down           down
      5/10(channelized)               down           down
      5/11(channelized)               down           down
      3/0(channelized)                down           down
      3/1(channelized)                down           down
      3/2(channelized)                down           down
      4/0:1/1(unchannelized)          up             down
      4/2:1/1(channelized)            up             lowerLayerDown

- Field descriptions for a T1 channel
  - Description—Text description or alias if configured for the interface
  - ifOperStatus—Physical state of the interface:
    - ifOperDown—Interface is not functioning
    - ifOperLowerLayerDown—Lower layer in the interface stack is not functioning
    - ifOperNotPresent—Module has been removed from the chassis
    - ifOperTesting—Interface is being tested
    - ifOperUp—Interface is functioning
  - Yellow Alarm detection—Status of yellow alarm detection: active or not active
  - Yellow Alarm generation—Status of yellow alarm generation: active or not active
  - snmp trap link-status—Status of SNMP trapping (enabled or disabled)
  - Framing—Type of framing format
  - Clock source—Type of clock source
  - Loopback state—Type of loopback (if enabled) and status: enabled or disabled
  - Last remote loopback request sent—None or deactivate
  - FDL—Status of FDL: standard configured or not configured
  - FDL Transmit Path—Status of path transmission: active or not active
  - FDL Transmit Idle-Signal—Status of idle signal: active or not active
  - FDL Transmit Test-Signal—Status of test signal: active or not active
  - Equipment Identification Code—eic string for FDL
  - Line Identification Code—lic string for FDL
  - Frame Identification Code—fic string for FDL
  - Unit Identification Code—unit string for FDL
  - Facility Identification Code—pfi string for FDL
  - Port Code—port string for FDL
  - Generator Number—generator string for FDL
  - BERT test—Number of current test and total number of tests
    - Test interval—Length of the BERT test
    - status—Sync (controller is synchronized with remote device) or NoSync (controller is not synchronized with remote device)
    - Sync count—Number of times the pattern detector synchronized with the incoming data pattern
    - Received bit count—Number of bits received
    - Error bit count—Number of bits with errors
  - Number of valid intervals—Number of 15-minute intervals since the line module was last powered on or reset
  - Time elapse in current interval—Statistics are reported in 15-minute intervals
  - Errored seconds—Number of errored seconds encountered by a T1 in the current interval
  - Severely errored seconds—Number of severely errored seconds encountered by a T1 in the current interval
  - Severely errored frame seconds—Number of severely errored framing seconds encountered by a T1 in the current interval
  - Unavailable seconds—Number of unavailable seconds encountered by a T1 in the current interval
  - Clock slip seconds—Number of clock slips encountered by a T1 in the current interval
  - Path code violations—Number of coding violations encountered by a T1 in the current interval
  - Line errored seconds—Number of line errored seconds encountered by a T1 in the current interval
  - Bursty errored seconds—Number of bursty errored seconds encountered by a T1 in the current interval
  - Degraded minutes—Number of minutes that a T1 line is degraded
  - Line code violations—Number of line code violations encountered by a T1 in the current interval
- Example 1—In this example, a T1 channel and the brief keyword are specified.

      host1#show controllers t1 2/0:1 brief

      DS3 2/0:1
      ifOperStatus = ifOperUp
      Yellow Alarm detection is active
      Yellow Alarm generation is active
      snmp trap link-status = disabled
      Framing is D4, Line Code is Ami, Clock Source is Internal - Module
      Allocated Ds0 time slot map = 0x0
      Loopback Enabled - Diagnostic
      Last Remote Loopback Request Sent - Deactivate
      FDL is not configured
      FDL Transmit Path-Id is not active
      FDL Transmit Test-Signal is not active
      FDL Transmit Idle-Signal is not active
      Equipment Identification Code is the null string
      Line Identification Code is the null string
      Frame Identification Code is the null string
      Unit Identification Code is the null string
      Facility Identification Code is the null string
      Port Code is the null string
      Generator Number is the null string
      BERT test - 2 in 23
      Test Interval 1 minute(s), Complete
      Sync count = 1
      Received bit count = 92148912
      Error bit count = 17
      Number of valid interval - 90
      Time elapse in current interval - 580

- Example 2—In this example, the brief keyword is specified for all T1 channels.

      host1#show controllers t1 brief

      Interfaces                  ifAdminStatus   OperationalStatus
      5/0:1(framed)                    up              lowerLayerDown
      5/0:2(framed)                    up              lowerLayerDown
      5/0:3(framed)                    up              lowerLayerDown
      5/0:4(framed)                    up              lowerLayerDown
      5/0:5(framed)                    up              lowerLayerDown
      5/0:6(framed)                    up              lowerLayerDown
      ...
      5/2:26(framed)                   up              lowerLayerDown
      5/2:27(framed)                   up              lowerLayerDown
      5/2:28(framed)                   up              lowerLayerDown

- Example 3—In this example, a T1 channel is specified.

      host1#show controllers t1 1/0:1

      DS1 1/0:1
      Description: toronto t1 channel
      ifOperStatus = ifOperUp
      Yellow Alarm detection is active
      Yellow Alarm generation is active
      snmp trap link-status = disabled
      Framing is D4, Line Code is Ami, Clock Source is Internal - Module
      Allocated Ds0 time slot map = 0x0
      Last Remote Loopback Request Sent - Deactivate
      FDL is not configured
      FDL Transmit Path-Id is not active
      FDL Transmit Test-Signal is not active
      FDL Transmit Idle-Signal is not active
      Equipment Identification Code is the null string
      Line Identification Code is the null string
      Frame Identification Code is the null string
      Unit Identification Code is the null string
      Facility Identification Code is the null string
      Port Code is the null string
      Generator Number is the null string
      BERT test - 2 in 23
      Test Interval 1 minute(s), Complete
      Sync count = 1
      Received bit count = 92148912
      Error bit count = 17
      Number of valid interval - 90
      Time elapse in current interval - 580

      Ds1 Current Interval Counters
      Errored seconds = 0
      Severely errored second = 0
      Severely errored frame seconds = 0
      Unavailable seconds = 0
      Clock slip seconds = 0
      Path code violations = 0
      Line errored seconds = 0
      Bursty errored seconds = 0
      Degraded minutes = 0
      Line code violations = 0

      Ds1 Last Interval Counters
      Errored seconds = 0
      Severely errored second = 0
      Severely errored frame seconds = 0
      Unavailable seconds = 0
      Clock slip seconds = 0
      Path code violations = 0
      Line errored seconds = 0
      Bursty errored seconds = 0
      Degraded minutes = 0
      Line code violations = 0

      Ds1 24 Hour Total Counters
      Errored seconds = 25
      Severely errored second = 7
      Severely errored frame seconds = 25
      Unavailable seconds = 0
      Clock slip seconds = 6
      Path code violations = 18
      Line errored seconds = 0
      Bursty errored seconds = 0
      Degraded minutes = 0
      Line code violations = 0

- See show controllers t1.
- See show controllers t3.

show controllers t3 ft1

- Use to display information about the state of a fractional T1 subchannel.
- Field descriptions
  - Description—Text description or alias if configured for the interface
  - ifOperStatus—Physical status of the interface
    - ifOperUp—Interface is functioning
    - ifOperTesting—Interface is being tested
    - ifOperNotPresent—Module has been removed from the chassis
    - ifOperDown—Interface is not functioning
  - snmp trap link-status of SNMP trapping (enabled or disabled)
  - Ds0 time slot map—Fractional T1 subchannel
  - Ds0 mode—Base data rate: either Nx56 or Nx64
- The ft1 option displays the state of the serial interface.
- The optional slot and port parameters display information about a specific slot and port.
- Example

      host1#show controllers t3 ft1

      Ft1 Interface at 2/0:1/1
      Description: toronto ft1 interface
      ifOperStatus = ifOperLowerLayerDown
      snmp trap link-status = disabled
      Ds0 time slot map = 0x1
      Ds0 mode = Nx64

- See show controllers t3.

show controllers t3 remote

- Use to display MIB statistics for the remote end of a channelized T3 interface configured for MDL or for the remote end of a T1 channel configured for FDL.
- Specify the all option to display detailed information for all 15-minute intervals.
- For definitions of the MIB statistics for a T3 interface, see RFC 2496—Definitions of Managed Objects for the DS3/E3 Interface Types (January 1999).
- For definitions of the MIB statistics for a T1 channel, see RFC 2495—Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types (January 1999).
- Field descriptions for a T3 interface
  - Far End MDL Carrier bit—Status of MDL configuration on remote device connected to T3 interface
    - set—MDL is configured for carrier mode
    - not set—MDL is not configured for carrier mode
  - Far End Equipment Identification Code—eic string sent by remote device for MDL
  - Far End Line Identification Code—lic string sent by remote device for MDL
  - Far End Frame Identification Code—fic string sent by remote device for MDL
  - Far End Unit Identification Code—unit string sent by remote device for MDL
  - Far End Facility Identification Code—pfi string sent by remote device for MDL
  - Far End Generator Number—generator string sent by remote device for MDL
  - Far End Port Number—port string sent by remote device for MDL
  - Number of valid intervals—Number of 15-minute intervals since the line module was last powered on or reset
  - Time elapse in current interval—Number of seconds that have passed in the 15-minute (900-second) interval
  - C-bit errored seconds—Number of C-bit errored seconds encountered by a T3 in the current interval
  - C-bit severely errored seconds—Number of C-bit severely errored seconds encountered by a T3 in the current interval
  - C-bit coding violations—Number of C-bit coding violations encountered by a T3 in the current interval
  - Unavailable seconds—Number of unavailable seconds encountered by a T3 in the current interval
  - Invalid seconds—Number of seconds when statistics were not collected
- Example—In this example, a T3 interface is specified.

      host1#show controllers t3 5/0 remote

      Far End MDL Carrier bit is not set
      Far End Equipment Identification Code is the null string
      Far End Line Identification Code is the null string
      Far End Frame Identification Code is the null string
      Far End Unit Identification Code is the null string
      Far End Facility Identification Code is the null string
      Far End Generator Number is the null string
      Far End Port Number is the null string

      Number of valid interval - 3
      Time elapse in current interval - 756

      Ds3 Current Interval Counters
      C-bit errored seconds          = 0
      C-bit severely errored seconds = 0
      C-bit coding violations        = 0
      Unavailable seconds            = 0
      Invalid seconds                = 0
      Ds3 Last Interval Counters
      C-bit errored seconds          = 0
      C-bit severely errored seconds = 0
      C-bit coding violations        = 0
      Unavailable seconds            = 0
      Invalid seconds                = 0

      Ds3 24 Hour Total Counters
      C-bit errored seconds          = 1
      C-bit severely errored seconds = 1
      C-bit coding violations        = 330
      Unavailable seconds            = 0
      Invalid seconds                = 0

- Field descriptions for a T1 channel
  - DS1—Identifier of T1 channel
  - Number of valid intervals—Number of 15-minute intervals since the line module was last powered on or reset
  - Time elapse in current interval—Number of seconds that have passed in the 15-minute (900-second) interval
  - Far End FDL Carrier bit—Status of FDL configuration on remote device connected to T1 channel
    - set—FDL is configured for carrier mode
    - not set—FDL is not configured for carrier mode
  - Far End Equipment Identification Code—eic string sent by remote device for FDL
  - Far End Line Identification Code—lic string sent by remote device for FDL
  - Far End Frame Identification Code—fic string sent by remote device for FDL
  - Far End Unit Identification Code—unit string sent by remote device for FDL
  - Far End Facility Identification Code—pfi string sent by remote device for FDL
  - Far End Generator Number—generator string sent by remote device for FDL
  - Far End Port Number—port string sent by remote device for FDL
  - Errored seconds—Number of errored seconds encountered by a T1 in the current interval
  - Severely errored seconds—Number of severely errored seconds encountered by a T1 in the current interval
  - Severely errored frame seconds—Number of severely errored framing seconds encountered by a T1 in the current interval
  - Unavailable seconds—Number of unavailable seconds encountered by a T1 in the current interval
  - Clock slip seconds—Number of clock slips encountered by a T1 in the current interval
  - Path code violations—Number of coding violations encountered by a T1 in the current interval
  - Line errored seconds—Number of line errored seconds encountered by a T1 in the current interval
  - Bursty errored seconds—Number of bursty errored seconds encountered by a T1 in the current interval
  - Degraded minutes—Number of minutes that a T1 line is degraded
- Example—In this example, a T1 channel is specified.

      host1#show controllers t1 10/1:1 remote

      DS1 10/1:1
      Number of valid interval - 0
      Time elapse in current interval - 0

      Far End FDL Carrier bit is not set
      Far End Equipment Identification Code is the null string
      Far End Line Identification Code is the null string
      Far End Frame Identification Code is the null string
      Far End Unit Identification Code is the null string
      Far End Facility Identification Code is the null string
      Far End Port Number is the null string
      Far End Generator Number is the null string

      DS1 Current Interval Counters
      Errored seconds                = 0
      Severely errored second        = 0
      Severely errored frame seconds = 0
      Unavailable seconds            = 0
      Clock slip seconds             = 0
      Path code violations           = 0
      Line errored seconds           = 0
      Bursty errored seconds         = 0
      Degraded minutes               = 0

      DS1 24 Hour Total Counters
      Errored seconds                = 0
      Severely errored second        = 0
      Severely errored frame seconds = 0
      Unavailable seconds            = 0
      Clock slip seconds             = 0
      Path code violations           = 0
      Line errored seconds           = 0
      Bursty errored seconds         = 0
      Degraded minutes               = 0

- See show controllers t3 remote.

show controllers t3 serial

- Use to display the state of the serial interface.
- Field descriptions
  - Description—Text description or alias if configured for the interface
  - ifOperStatus—Physical status of the interface
    - ifOperUp—Interface is functioning
    - ifOperTesting—Interface is being tested
    - ifOperNotPresent—Module has been removed from the chassis
    - ifOperDown—Interface is not functioning
  - snmp trap link-status of SNMP trapping (enabled or disabled)
  - Crc type checking—Size of the cyclic redundancy check (CRC)
  - Hdlc mru—Current size of the maximum receive unit (MRU)
  - Hdlc mtu—Current size of the maximum transmission unit (MTU)
  - Hdlc interface speed—Current line speed of the interface
  - Ds0 time slot map—T1 subchannel
  - Invert data disabled—Status of the data inversion feature
- The optional slot and port parameters display information about a specific slot and port.
- Use the slot/port:channel/subchannel option to display information about a specific interface.
- Example

      host1#show controllers t3 serial

      Serial Interface at 2/0:1/1
      ifOperStatus = ifOperLowerLayerDown
      snmp trap link-status = disabled
      Crc type checking - CRC16
      Hdlc mru = 9996
      Hdlc mtu = 9996
      Hdlc interface speed = 64000
      Ds0 time slot map = 0x1
      Invert data disabled, Ds0 mode = Nx64

      Serial Interface at 2/1:1/1
      ifOperStatus = ifOperLowerLayerDown
      snmp trap link-status = disabled
      Crc type checking - CRC16
      Hdlc mru = 9996
      Hdlc mtu = 9996
      Hdlc interface speed = 64000
      Ds0 time slot map = 0x1
      Invert data disabled, Ds0 mode = Nx64

      Found 2 Serial Interfaces

- See show controllers t3.

show interfaces serial

- Use to display information about the serial interfaces you specify.
- Field descriptions
  - Fractional Interface—Location of a channelized T1 or E1 interface
  - Description—Text description or alias if configured for the interface
  - ifOperStatus—Administrative status of the interface
    - ifOperUp—Interface is functioning
    - ifOperTesting—Interface is being tested
    - ifOperNotPresent—Module has been removed from the chassis
    - ifOperDown—Interface is not functioning
    - ifOperLowerDown—Lower layer in the interface stack is not functioning
  - snmp trap link-status—Enabled or disabled
  - Encapsulation—Layer 2 encapsulation display; options include: ppp, frame-relay ietf, mlppp, mlframe-relay ietf, hdlc
  - Crc type checking—Size of the CRC
  - Hdlc mru—Current size of the MRU
  - Hdlc mtu—Current size of the MTU
  - Hdlc interface speed—Current line speed of the interface
  - Hdlc idle-character—Current idle character
  - Invert data disabled—Status of the data inversion feature
  - Ds0 time slot map—Channelized T1 or E1 channel group
  - Ds0 mode—Nx56 or Nx64
  - 5 minute input rate—Data rates based on the traffic received in the last five minutes
  - 5 minute output rate—Data rates based on the traffic sent in the last five minutes
  - Interface statistics
    - Packets received—Number of packets received on the interface
    - Bytes received—Number of bytes received on the interface
    - Errored packets received—Number of packets with errors received on the interface
    - Packets sent—Number of packets sent on the interface
    - Bytes sent—Number of bytes sent on the interface
- Errored packets sent—Number of packets with errors sent from the interface
- Example

      host1#show interfaces serial 0/1:2 brief

      Serial Interface at 0/1:2
      Description: ottawa012 hdlc channel
      ifOperStatus = ifOperUp
      snmp trap link-status = disabled
      Encapsulation hdlc
      Crc type checking - CRC16
      Hdlc mru = 1600
      Hdlc mtu = 1600
      Hdlc interface speed = 768000
      Hdlc idle-character marks
      Invert data disabled
      Ds0 time slot map = 0xfff
      Ds0 mode = Nx64

      Serial Interface at 13/0:2
      Description: ottawa013 hdlc channel
      ifOperStatus = ifOperUp
      snmp trap link-status = disabled
      Crc type checking - CRC16
      Hdlc mru = 1600
      Hdlc mtu = 1600
      Hdlc interface speed = 768000
      Invert data disabled
      Ds0 time slot map = 0xfff000
      Ds0 mode = Nx64

      Found 2 Serial Interfaces

- See show interfaces.