Monitor Channelized OC12 IQ Interfaces

Purpose

By monitoring Channelized OC12 intelligent queuing (IQ) interfaces, you begin the process of isolating Channelized OC12 IQ interface problems when they occur.

To monitor your Channelized OC12 IQ interface, follow these steps:

Display the Status of a Channelized OC12 IQ Interface

Purpose

To display the status of Channelized OC12 IQ interfaces, use one or all of the following Junos OS CLI operational mode commands:

Action

user@host> show interfaces terse coc* user@host> show interfaces controller user@host> show interfaces terse

Sample Output 1

user@host> show interfaces terse coc*

Interface               Admin Link Proto Local                 Remote
coc12-0/0/0             up    up  
coc1-0/0/0:2            up    up  
coc1-0/0/0:3            up    up  
coc1-0/0/0:4            up    up  
coc1-0/0/0:5            up    up  
coc1-0/0/0:6            up    up

Sample Output 2

user@host> show interfaces controller

Controller                                                            Admin Link
coc12-0/0/0                                                          up    up  
    so-0/0/0:1                                                       up    up  
    coc1-0/0/0:2                                                     up    up  
        t1-0/0/0:2:1                                                 up    up  
        t1-0/0/0:2:2                                                 up    up  
        t1-0/0/0:2:3                                                 up    up  
        t1-0/0/0:2:4                                                 up    up  
        t1-0/0/0:2:5                                                 up    up  
        t1-0/0/0:2:6                                                 up    up  
        t1-0/0/0:2:7                                                 up    up  
        t1-0/0/0:2:8                                                 up    up  
        t1-0/0/0:2:9                                                 up    up  
        t1-0/0/0:2:10                                                up    up  
        t1-0/0/0:2:11                                                up    up  
        t1-0/0/0:2:12                                                up    up  
        t1-0/0/0:2:13                                                up    up  
        t1-0/0/0:2:14                                                up    up  
        t1-0/0/0:2:15                                                up    up  
        t1-0/0/0:2:16                                                up    up  
        t1-0/0/0:2:17                                                up    up  
        t1-0/0/0:2:18                                                up    up  
        t1-0/0/0:2:19                                                up    up  
        t1-0/0/0:2:20                                                up    up  
        t1-0/0/0:2:21                                                up    up  
        t1-0/0/0:2:22                                                up    up  
        t1-0/0/0:2:23                                                up    up  
        t1-0/0/0:2:24                                                up    up  
        t1-0/0/0:2:25                                                up    up  
        t1-0/0/0:2:26                                                up    up  
        t1-0/0/0:2:27                                                up    up  
        t1-0/0/0:2:28                                                up    up  
    coc1-0/0/0:3                                                     up    up  
    t3-0/0/0:3                                                       up    up  
    coc1-0/0/0:4                                                     up    up  
        ct1-0/0/0:4:1                                                up    up  
            ds-0/0/0:4:1:1                                           up    up  
    coc1-0/0/0:5                                                     up    up  
    ct3-0/0/0:5                                                      up    up  
        t1-0/0/0:5:1                                                 up    up  
    coc1-0/0/0:6                                                     up    up  
    ct3-0/0/0:6                                                      up    up  
        ct1-0/0/0:6:1                                                up    up  
            ds-0/0/0:6:1:1                                           up    up

Sample Output 3

                          user@host> show interfaces
terse

Interface               Admin Link Proto Local                 Remote
coc12-0/0/0             up    up  
so-0/0/0:1              up    up  
so-0/0/0:1.0            up    up   inet  20.20.20.1/30   
coc1-0/0/0:2            up    up  
t1-0/0/0:2:1            up    up  
t1-0/0/0:2:1.0          up    up   inet  20.20.20.5/30   
t1-0/0/0:2:2            up    up  
[...Output Truncated...]
t1-0/0/0:2:27           up    up  
t1-0/0/0:2:28           up    up  
coc1-0/0/0:3            up    up  
t3-0/0/0:3              up    up  
coc1-0/0/0:4            up    up  
ct1-0/0/0:4:1           up    up  
ds-0/0/0:4:1:1          up    up  
ds-0/0/0:4:1:1.0        up    up   inet  20.20.20.13/30  
coc1-0/0/0:5            up    up  
ct3-0/0/0:5             up    up  
t1-0/0/0:5:1            up    up  
t1-0/0/0:5:1.0          up    up   inet  20.20.20.17/30  
coc1-0/0/0:6            up    up  
ct3-0/0/0:6             up    up  
ct1-0/0/0:6:1           up    up  
ds-0/0/0:6:1:1          up    up  
ds-0/0/0:6:1:1.0        up    up   inet  20.20.20.21/30

Meaning

The sample output shows the status of both the physical and logical interfaces. In this example, all of the channelized OC12 IQ interfaces are up.

Sample output 1 shows the channelized interfaces that are configured, but not the channels for those channelized interfaces.

Sample output 2 shows the channels for the channelized interfaces that are configured and the hierarchy, but not the interface address information. At the top, the hierarchy includes the controller interface coc12-0/0/0.

Sample output 3 shows all channelized interfaces and their configured channels and the address information.

When only one or some individual channels are down, you must troubleshoot the channel by checking the configuration, transmission network, and equipment. If all of the physical layers for the channels are down, you must work with this as a T1, T3, DS0, or OC12 SONET link or PIC problem. For more information on monitoring these types of interfaces, see the respective sections in this guide.

The interface configuration of the OC12 IQ interface used for all show commands in this section is shown in Figure 22.

Figure 22: Sample Configuration of Channelized OC12 IQ Interface

In addition, the configuration is shown in the following output:

interfaces { coc12-0/0/0 { partition 1 oc-slice 1-3 interface-type so; partition 2 oc-slice 4 interface-type coc1; partition 3 oc-slice 5 interface-type coc1; partition 4 oc-slice 6 interface-type coc1; partition 5 oc-slice 7 interface-type coc1; partition 6 oc-slice 8 interface-type coc1;} so-0/0/0:1 {description "oc-slice 1-3 of coc12-0/0/0. COC12 > OC3."; unit 0 { family inet { address 20.20.20.2/30;}}} coc1-0/0/0:2 {description "oc-slice 4 of coc12-0/0/0. COC12 to COC1 VT-mapped to T1s."; partition 1-28 interface-type t1;} t1-0/0/0:2:1 { unit 0 { family inet { address 20.20.20.6/30;}}} coc1-0/0/0:3 {description " oc-slice 5 of coc12-0/0/0. COC12 to COC1 converted to a T3."; no-partition interface-type t3;} t3-0/0/0:3:1 { unit 0 { family inet { address 20.20.20.10/30;}}} coc1-0/0/0:4 {description " oc-slice 6 of coc12-0/0/0. CT1 to NxDS-Os."; partition 1 interface-type ct1;} ct1-0/0/0:4:1 { partition 1 timeslots 1-10 interface-type ds;} ds-0/0/0:4:1:1 { unit 0 { family inet { address 20.20.20.14/30;}}} coc1-0/0/0:5 {description " oc-slice 7 of coc12-0/0/0. COC12 to COC1 converted to a CT3 to T1s."; no-partition interface-type ct3;} ct3-0/0/0:5 { partition 1 interface-type t1;} t1-0/0/0:5:1 { unit 0 { family inet { address 20.20.20.18/30;}}} coc1-0/0/0:6 {description " oc-slice 8 of coc12-0/0/0. COC12 to COC1 converted to a CT3 to CT1 to NxDS-0s."; no-partition interface-type ct3;} ct3-0/0/0:6 { partition 1 interface-type ct1;} ct1-0/0/0:6:1 { partition 1 timeslots 1 interface-type ds;} ds-0/0/0:6:1:1 { unit 0 { family inet { address 20.20.20.22/30;}}}}

The above configuration shows the OC12 IQ interface configured into eight channels or slices as shown in Figure 22. A summary of the channels follows:

Channels 1 through 3 are for SONET interfaces
Channel 4 is for T1 interfaces
Channel 5 is for T3 interfaces
Channel 6 is for DS0 interfaces
Channels 7 is for T1 interfaces
Channel 8 is for DS0 interfaces

Display the Status of the Controller Channelized OC12 IQ Interface

Purpose

To display the status of the controller OC12 IQ interface, use one or all of the following Junos OS CLI operational mode commands, depending on the level of channelization:

Action

user@host> show interfaces interface-type-fpc/pic/port user@host> show interfaces interface-type-fpc/pic /port:channel:channel user@host> show interfaces interface-type-fpc/pic/port:channel:channel:channel

Sample Output 1

user@host> show interfaces coc12-0/0/0

Physical interface: coc12-0/0/0, Enabled, Physical link is Up
  Interface index: 195, SNMP ifIndex: 82
  Link-level type: Controller , Clocking: Internal, SONET mode, Speed: OC12,
  Loopback: None, Parent: None
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  CoS queues     : 4 supported
  Last flapped   : 2004-05-26 21:37:18 UTC (00:44:19 ago)
  SONET alarms   : None
  SONET defects  : None

Sample Output 2

user@host> show interfaces coc1-0/0/0:2

Physical interface: coc1-0/0/0:2, Enabled, Physical link is Up
  Interface index: 198, SNMP ifIndex: 88
  Link-level type: Controller , Clocking: Internal, SONET mode, Speed: 51840kbps,
  Loopback: None, Parent: coc12-0/0/0  Interface index 195
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  CoS queues     : 4 supported
  Last flapped   : 2004-05-26 22:19:18 UTC (00:07:06 ago)
  SONET alarms   : None
  SONET defects  : None

Sample Output 3

user@host> show interfaces ct3-0/0/0:5

Physical interface: ct3-0/0/0:5, Enabled, Physical link is Up
  Interface index: 233, SNMP ifIndex: 169
  Link-level type: Controller , Clocking: Internal, Speed: T3, Loopback: None,
  Mode: C/Bit parity, Parent: coc1-0/0/0:5 Interface index 232
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  CoS queues     : 4 supported
  Last flapped   : Never
  Active alarms  : None
  Active defects : None
  DS-3 BERT configuration:
    BERT time period: 10 seconds, Elapsed: 0 seconds
    Algorithm: 2^3 - 1, Pseudorandom (1), Induced error rate: 10e-0

Sample Output 4

user@host> show interfaces ct1-0/0/0:4:1

Physical interface: ct1-0/0/0:4:1, Enabled, Physical link is Up
  Interface index: 230, SNMP ifIndex: 167
  Link-level type: Controller , Clocking: Internal, Speed: T1, Loopback: None,
  Framing: ESF, Parent: coc1-0/0/0:4  Interface index 229
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  CoS queues     : 4 supported
  Last flapped   : Never
  DS1   alarms   : None
  DS1   defects  : None
  SONET alarms   : None
  SONET defects  : None

Meaning

The first line of the output shows the status of the link. If this line shows that the physical link is up, the physical link is healthy and can pass packets. If this line shows that the physical link is down, the physical link is unhealthy and cannot pass packets.

The controller interface is partitioned into other interface types and appears at the top of a specific level of channelization. For a visual representation of the controller interface at different levels of channelization, see Figure 23.

Figure 23: Controller Interfaces at Different Levels of Channelization

Each of the four examples of controller output is for a different level of channelization.

Sample output 1 for interface coc12-0/0/0 shows Parent: None, which indicates the top-most level of channelization.

Sample output 2 for interface coc1-0/0/0:2 shows Parent: coc12-0/0/0,which indicates that this interface is one level down from the top-most level, and is the OC1 controller for a first level of channelization.

Sample output 3 for interface ct3-0/0/0:5 shows Parent: coc1-0/0/0:5, which indicates that this interface is at the second level of channelization, and is a CT3 controller.

Sample output 4 for interface ct1-0/0/0:4:1 shows Parent: coc1-0/0/0:4:1,which indicates that this interface is at the third level of channelization, and is a CT1 controller.

Display the Status of a Specific Channel of a Channelized OC12 IQ Interface

Purpose

To display the status of a specific channel of an OC12 IQ interface, use the following Junos OS CLI operational mode command:

Action

user@host> show interfaces interface-type-fpc/pic/port:channel user@host> show interfaces interface-type-fpc/pic/port:channel:channel user@host> show interfaces interface-type-fpc/pic/port:channel:channel:channel

Sample Output 1

user@host> show interfaces so-0/0/0:1

Physical interface: so-0/0/0:1, Enabled, Physical link is Up
  Interface index: 197, SNMP ifIndex: 131
  Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3,
  Loopback: None, FCS: 16, Payload scrambler: Enabled,
  Parent: coc12-0/0/0  Interface index 195
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive: Input: 17 (00:00:01 ago), Output: 17 (00:00:08 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  CoS queues     : 4 supported
  Last flapped   : 2004-05-26 22:19:18 UTC (00:02:59 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  SONET alarms   : None
  SONET defects  : None
  Logical interface so-0/0/0:1.0 (Index 70) (SNMP ifIndex 132) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Flags: None
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 20.20.20.0/30, Local: 20.20.20.1, Broadcast: 20.20.20.3

Sample Output 2

user@host> show interfaces t1-0/0/0:2:1

Physical interface: t1-0/0/0:2:1, Enabled, Physical link is Up
  Interface index: 199, SNMP ifIndex: 133
  Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1,
  Loopback: None, FCS: 16, Framing: ESF,
  Parent: coc1-0/0/0:2  Interface index 198
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive: Input: 44 (00:00:07 ago), Output: 46 (00:00:01 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  CoS queues     : 4 supported
  Last flapped   : Never
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  DS1   alarms   : None
  DS1   defects  : None
  SONET alarms   : None
  SONET defects  : None
  Logical interface t1-0/0/0:2:1.0 (Index 71) (SNMP ifIndex 134) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 1500
      Flags: None
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 20.20.20.4/30, Local: 20.20.20.5, Broadcast: 20.20.20.7

Sample Output 3

user@host> show interfaces ds-0/0/0:4:1:1

Physical interface: ds-0/0/0:4:1:1, Enabled, Physical link is Up
  Interface index: 231, SNMP ifIndex: 168
  Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 640kbps,
  Loopback: None, FCS: 16, Parent: ct1-0/0/0:4:1  Interface index 230
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive: Input: 58 (00:00:06 ago), Output: 59 (00:00:01 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  CoS queues     : 4 supported
  Last flapped   : Never
  Input rate     : 48 bps (0 pps)
  Output rate    : 48 bps (0 pps)
  DS0 BERT configuration:
    BERT time period: 10 seconds, Elapsed: 0 seconds
    Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
  Logical interface ds-0/0/0:4:1:1.0 (Index 75) (SNMP ifIndex 173) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 1500
      Flags: None
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 20.20.20.12/30, Local: 20.20.20.13, Broadcast: 20.20.20.15

Meaning

Sample output 1 shows an OC3 SONET interface. Sample output 2 shows a T1 interface that is the result of a partitioned OC1 interface, and sample output 3 shows a DS0 interface that is the result of an OC1 interface partitioned into a T1 interface, which is further partitioned into the DS0 interface.

Figure 24 shows a visual representation of the different channel levels.

Figure 24: Specific Channels of a Channelized OC12 IQ Interface

Display Extensive Status Information for a Channelized OC12 IQ Interface

Purpose

To display extensive status information for a Channelized OC12 IQ interface, use the following Junos OS CLI operational mode command:

Action

user@host> show interfaces interface-type-interface-name extensive

Sample Output 1

The following sample output is for a controller interface:

user@host> show interfaces coc12-0/0/0 extensive
Physical interface: coc12-0/0/0, Enabled, Physical link is Up
  Interface index: 138, SNMP ifIndex: 82, Generation: 21
  Link-level type: Controller, Clocking: Internal, SONET mode, Speed: OC12,
  Loopback: None, Parent: None
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  Hold-times     : Up 0 ms, Down 0 ms
  CoS queues     : 4 supported
  Last flapped   : 2004-05-18 21:25:45 UTC (2d 00:04 ago)
  Statistics last cleared: Never
  SONET alarms   : None
  SONET defects  : None
  SONET PHY:            Seconds        Count  State
    PLL Lock                  0            0  OK
    PHY Light                 0            0  OK
  SONET section:
    BIP-B1                    0            0
    SEF                      77            1  OK
    LOS                      77            1  OK
    LOF                      77            1  OK
    ES-S                     77
    SES-S                    77
    SEFS-S                   77
  SONET line:
    BIP-B2                    0            0
    REI-L                 82584      1274876
    RDI-L                     5            1  OK
    AIS-L                     0            0  OK
    BERR-SF                  77            1  OK
    BERR-SD                   2            1  OK
    ES-L                     77
    SES-L                    77
    UAS-L                    67
    ES-LFE                82589
    SES-LFE                   5
    UAS-LFE                   0
  Received SONET overhead:
    F1      : 0x00, J0      : 0x00, K1      : 0x00, K2      : 0x00
    S1      : 0x00
  Transmitted SONET overhead:
    F1      : 0x00, J0      : 0x01, K1      : 0x00, K2      : 0x00
    S1      : 0x00

Sample Output 2

The following sample output is for a channel on a Channelized OC12 IQ interface:

user@host> show interfaces t1-0/0/0:2:1 extensive 
Physical interface: t1-0/0/0:2:1, Enabled, Physical link is Up
  Interface index: 186, SNMP ifIndex: 133, Generation: 69
  Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1,
  Loopback: None, FCS: 16, Framing: ESF,
  Parent: coc1-0/0/0:2 Interface index 185
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Hold-times     : Up 0 ms, Down 0 ms
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive statistics:
    Input : 444 (last seen 00:00:05 ago)
    Output: 442 (last sent 00:00:09 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  CoS queues     : 4 supported
  Last flapped   : Never
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                10948                    0 bps
   Output bytes  :                11792                    0 bps
   Input  packets:                  892                    0 pps
   Output packets:                  940                    0 pps
  Input errors:
    Errors: 2, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0,
    Policed discards: 2, L3 incompletes: 0, L2 channel errors: 0,
    L2 mismatch timeouts: 0, HS link CRC errors: 0, SRAM errors: 0
  Output errors:
    Carrier transitions: 1, Errors: 0, Drops: 0, Aged packets: 0
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                    3                    3                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0
    3 network-cont                 937                  937                    0
  DS1   alarms   : None
  DS1   defects  : None
   T1  media:            Seconds        Count  State
    SEF                       1            1  OK
    BEE                       2            2  OK
    AIS                       0            0  OK
    LOF                     108            1  OK
    LOS                       0            0  OK
    YELLOW                    0            0  OK
    BPV                       0            0
    EXZ                       0            0
    LCV                       1            1
    PCV                       0            0
    CS                        0            0
    LES                     108
    ES                      108
    SES                     108
    SEFS                    108
    BES                       0
    UAS                     116
  HDLC configuration:
    Policing bucket: Disabled
    Shaping bucket : Disabled
    Giant threshold: 1514, Runt threshold: 0
    Timeslots      : All active
    Line encoding: B8ZS, Byte encoding: Nx64K
    Buildout       : 0 to 132 feet
    Data inversion: Disabled, Idle cycle flag: flags, Start end flag: shared
  DS1 BERT configuration:
    BERT time period: 10 seconds, Elapsed: 0 seconds
    Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
  SONET alarms   : None
  SONET defects  : None
  SONET vt:
    BIP-BIP2                  0            0
    REI-V                    25           25
    LOP-V                    93            1  OK
    AIS-V                     0            0  OK
    RDI-V                     0            0  OK
    UNEQ-V                    0            0  OK
    PLM-V                    93            1  OK
    ES-V                     93
    SES-V                    93
    UAS-V                    83
    ES-VFE                   25
    SES-VFE                  25
    UAS-VFE                   0
  Received SONET overhead:
    V5      : 0x02, V5(cmp) : 0x02
  Transmitted SONET overhead:
    V5      : 0x02
  Packet Forwarding Engine configuration:
    Destination slot: 0, PLP byte: 4 (0x00)
  Logical interface t1-0/0/0:2:1.0 (Index 70) (SNMP ifIndex 134)
  (Generation 15)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 1500, Generation: 24, Route table: 0
      Flags: None   
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 20.20.20.4/30, Local: 20.20.20.5, Broadcast: 20.20.20.7,
        Generation: 29

Meaning

The sample output shows where the errors might be occurring: either with the channel media or the SONET layer. In this example, there are no errors. However, if errors occur, you must troubleshoot the channel media or the SONET layer. For more information, see the sections of this guide that correspond to the media with which you are working.

Monitor Statistics for a Channelized OC12 IQ Interface

Purpose

To monitor statistics for a Channelized OC12 interface, use the following Junos OS CLI operational mode command:

Action

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

Sample Output

user@host> monitor interfaces so-0/0/0:1.0

host         Seconds: 10                  Time: 00:23:13
                                                              Delay: 0/0/32
Interface: so-0/0/0:1.0, Enabled, Link is Up
Flags: Point-To-Point SNMP-Traps
Encapsulation: PPP
Local statistics:                                             Current delta
  Input bytes:                     431244                               [0]
  Output bytes:                    432268                               [0]
  Input packets:                    35933                               [0]
  Output packets:                   36019                               [0]
Remote statistics:
  Input bytes:                          0 (0 bps)                       [0]
  Output bytes:                         0 (0 bps)                       [0]
  Input packets:                        0 (1 pps)                       [0]
  Output packets:                       0 (0 pps)                       [0]
Traffic statistics:
  Input bytes:                     431244                               [0]
  Output bytes:                    432268                               [0]
  Input packets:                    35933                               [0]
  Output packets:                   36019                               [0]
Protocol: inet, MTU: 4470

user@host> monitor interfaces t1-0/0/0:2:1.0 
host         Seconds: 1                   Time: 00:32:07
                                                              Delay: 0/0/26
Interface: t1-0/0/0:2:1.0, Enabled, Link is Up
Flags: Point-To-Point SNMP-Traps
Encapsulation: PPP
Local statistics:                                             Current delta
  Input bytes:                     432028                               [0]
  Output bytes:                    433076                               [0]
  Input packets:                    35954                               [0]
  Output packets:                   36041                               [0]
Remote statistics:
  Input bytes:                          0 (0 bps)                       [0]
  Output bytes:                         0 (0 bps)                       [0]
  Input packets:                        0 (0 pps)                       [0]
  Output packets:                       0 (0 pps)                       [0]
Traffic statistics:
  Input bytes:                     432028                               [0]
  Output bytes:                    433076                               [0]
  Input packets:                    35954                               [0]
  Output packets:                   36041                               [0]
Protocol: inet, MTU: 1500

user@host> monitor interfaces ds-0/0/0:4:1:1.0 
host         Seconds: 3                   Time: 00:36:59
                                                               Delay: 0/0/0
Interface: ds-0/0/0:4:1:1.0, Enabled, Link is Up
Flags: Point-To-Point SNMP-Traps
Encapsulation: PPP
Local statistics:                                             Current delta
  Input bytes:                     432836                               [0]
  Output bytes:                    433882                               [0]
  Input packets:                    36065                               [0]
  Output packets:                   36152                               [0]
Remote statistics:
  Input bytes:                          0 (0 bps)                       [0]
  Output bytes:                         0 (0 bps)                       [0]
  Input packets:                        0 (0 pps)                       [0]
  Output packets:                       0 (0 pps)                       [0]
Traffic statistics:
  Input bytes:                     432836                               [0]
  Output bytes:                    433882                               [0]
  Input packets:                    36065                               [0]
  Output packets:                   36152                               [0]
Protocol: inet, MTU: 1500

Meaning

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.