Display Alarms and Errors for Channelized DS-3 to DS-1 Interfaces

Action

To display channelized DS-3 to DS-1 alarms and errors, use the following JUNOS command-line interface (CLI) operational mode command:

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

Sample Output

user@host> show interfaces t1-2/1/0:19 extensive 

Physical interface: t1-2/1/0:19, Enabled, Physical link is Up

  Interface index: 50, SNMP ifIndex: 59, Generation: 49

  Description: Customer

  Link-level type: Cisco-HDLC, MTU: 1504, Clocking: Internal, Speed: T1, 
Loopback: None, FCS: 16,

  Mode: M23, Framing: ESF

  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 : 117 (last seen 00:00:08 ago)

    Output: 121 (last sent 00:00:01 ago)

  Statistics last cleared: 2002-08-01 10:14:45 UTC (00:19:38 ago)

  Traffic statistics:

   Input  bytes  :             22459734               236888 bps

   Output bytes  :            162288645              1322208 bps

   Input  packets:               201233                  214 pps

   Output packets:               236341                  227 pps

  Input errors:

    Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 377, L3 
incompletes: 0,

    L2 channel errors: 0, L2 mismatch timeouts: 0, HS link CRC errors: 0, SRAM 
errors: 0

  Output errors:

    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0

  DS1   alarms   : None

  DS3   alarms   : None

  DS1   defects  : None

  DS3   defects  : None

  T1  media:            Seconds        Count  State

    SEF                       0            0  OK

    BEE                       0            0  OK

    AIS                       0            0  OK

    LOF                       0            0  OK

    LOS                       0            0  OK

    YELLOW                    0            0  OK

    BPV                       0            0

    EXZ                       0            0

    LCV                       0            0

    PCV                       0            0

    CS                        0            0

    LES                       0

    ES                        0

    SES                       0

    SEFS                      0

    BES                       0

    UAS                       0

  DS3 media:            Seconds        Count  State

    PLL Lock                  0            0  OK

    Reframing                 0            0  OK

    AIS                       0            0  OK

    LOF                       0            0  OK

    LOS                       0            0  OK

    IDLE                      0            0  OK

    YELLOW                    0            0  OK

    BPV                       0            0

    EXZ                       0            0

    LCV                       0            0

    PCV                       0            0

    LES                       0

    PES                       0

    PSES                      0

    SEFS                      0

    UAS                       0

  Interface transmit queues:

              B/W  WRR       Packets        Bytes        Drops       Errors

    Queue0     95   95        234494    162020375            0            0

    Queue1      5    5           164         5808            0            0

  HDLC configuration:

    Giant threshold: 1514, Runt threshold: 3

    Timeslots      : All active

    Line encoding: B8ZS, Byte encoding: Nx64K, Data inversion: Disabled

  DS3 BERT configuration:

    BERT time period: 0 seconds, Elapsed: 0 seconds

    Algorithm: Unknown (0), Induced Error rate: 10e-0

  DS1 BERT configuration:

    BERT time period: 10 seconds, Elapsed: 0 seconds

    Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)

  PFE configuration:

    Destination slot: 2, PLP byte: 2 (0xab)

    CoS transmit queue          Bandwidth          Buffer     Priority   Limit

                              %          bps   %        bytes

    0 best-effort             0            0   0            0      low    none

    1 expedited-forwarding    0            0   0            0      low    none

    2 assured-forwarding      0            0   0            0      low    none

    3 network-control         0            0   0            0      low    none

  Logical interface t1-2/1/0:19.0 (Index 27) (SNMP ifIndex 125) (Generation 26)

    Flags: Point-To-Point SNMP-Traps Encapsulation: Cisco-HDLC

    Protocol inet, MTU: 1500, Flags: None, Generation: 34 Route table: 0

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 192.168.140.196/30, Local: 192.168.140.197, Broadcast: 
Unspecified, Generation: 44

What It Means

The sample output shows that there are no active alarms and active defects. When a major error (such as an alarm indication signal [AIS]) is seen for a few consecutive frames, a defect is declared within 1 second from detection. At the defect level, the interface is taken down and routing protocols are immediately notified (this is the default). In most cases, when a defect persists for 2.5 seconds plus or minus 0.5 seconds, an alarm is declared.

Notification messages are logged at the alarm level. Depending on the type of T1 alarm, you can configure the craft panel to display the red or yellow alarm LED and simultaneously have the alarm relay activate a physically connected device (such as a bell).

Table 55 shows T1 media-specific alarms or defects that can render the interface unable to pass packets.

Table 55: T1 Media Alarms and Error Definitions

T1 Media Alarm or Error	Definitions
AIS	Alarm indication signal (blue alarm)
BEE	Block error event
BES	Bursty errored seconds
BPV	Bipolar violation
CS	Controlled slip
ES	Errored seconds
EXZ	Excessive zeros
LCV	Line code violation
LES	Line errored seconds
LOF	Loss of frame
LOS	Loss of signal
PCV	Path code violation
SEF	Severely errored frame
SEFS	Severely errored frame seconds
SES	Severely errored seconds
UAS	Unavailable seconds
YLW	Yellow alarm

See Locate T1 Alarms and Errors for more details on T1 alarms and statistics.