Display ATM1 and ATM2 Alarms and Errors

Purpose

The alarms and errors that appear on an ATM1 or an ATM2 IQ interface are identical. ATM alarms and errors are dependent on the ATM interface media. If the ATM interface is an OC-3 or OC-12 interface media, the media statistics are SONET statistics. If the ATM interface is a T3 interface media, the media statistics are T3 statistics.

For information on determining the type of ATM interface on your router, see Determine ATM Interface Type.

Action

To display ATM alarms and errors, use the following JUNOS command-line interface (CLI) operational mode command:

user@host> show interfaces at-fpc/pic/port extensive

Sample Output 1

user@host> show interfaces at-2/0/0 extensive 

Physical interface: at-2/0/0, Enabled, Physical link is Up

  Interface index: 22, SNMP ifIndex: 42, Generation: 21

  Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode, Speed: 
OC3, Loopback: None, Payload scrambler: Enabled

  Device flags   : Present Running

  Link flags     : None

  Hold-times     : Up 0 ms, Down 0 ms

  Statistics last cleared: 2002-07-29 14:28:14 EDT (00:00:26 ago)

  Traffic statistics:

   Input  bytes  :                    0                    0 bps

   Output bytes  :                    0                    0 bps

   Input  packets:                    0                    0 pps

   Output packets:                    0                    0 pps

  Input errors:

    Errors: 0, Drops: 0, Invalid VCs: 0, Framing errors: 0, Policed discards: 0, 
L3 incompletes: 0, L2 channel errors: 0,

    L2 mismatch timeouts: 0

  Output errors:

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

  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                       0            0  OK

    LOS                       0            0  OK

    LOF                       0            0  OK

    ES-S                      0

    SES-S                     0

    SEFS-S                    0

  SONET line:

    BIP-B2                    0            0

    REI-L                     0            0

    RDI-L                     0            0  OK

    AIS-L                     0            0  OK

    BERR-SF                   0            0  OK

    BERR-SD                   0            0  OK

    ES-L                      0

    SES-L                     0

    UAS-L                     0

    ES-LFE                    0

    SES-LFE                   0

    UAS-LFE                   0

  SONET path:

    BIP-B3                    0            0

    REI-P                     0            0

    LOP-P                     0            0  OK

    AIS-P                     0            0  OK

    RDI-P                     0            0  OK

    UNEQ-P                    0            0  OK

    PLM-P                     0            0  OK

    ES-P                      0

    SES-P                     0

    UAS-P                     0

    ES-PFE                    0

    SES-PFE                   0

    UAS-PFE                   0

  Received SONET overhead:

    F1      : 0x00, J0      : 0x00, K1      : 0x00, K2      : 0x00

    S1      : 0x00, C2      : 0x13, C2(cmp) : 0x13, F2      : 0x00

    Z3      : 0x00, Z4      : 0x00, S1(cmp) : 0x00, V5      : 0x00

    V5(cmp) : 0x00

  Transmitted SONET overhead:

    F1      : 0x00, J0      : 0x01, K1      : 0x00, K2      : 0x00

    S1      : 0x00, C2      : 0x13, F2      : 0x00, Z3      : 0x00

    Z4      : 0x00, V5      : 0x00

  ATM status:

    HCS state:     Sync

    LOC      :       OK

  ATM Statistics:

    Uncorrectable HCS errors: 0, Correctable HCS errors: 0, Tx cell FIFO 
overruns: 0, Rx cell FIFO overruns: 0,

    Rx cell FIFO underruns: 0, Input cell count: 0, Output cell count: 8830024, 
Output idle cell count: 8830026,

    Output VC queue drops: 0, Input no buffers: 0, Input length errors: 0, Input 
timeouts: 0, Input invalid VCs: 0,

    Input bad CRCs: 0, Input OAM cell no buffers: 0

  PFE configuration:

    Destination slot: 2

    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 at-2/0/0.0 (Index 29) (SNMP ifIndex 49) (Generation 28)

    Flags: Point-To-Point SNMP-Traps Encapsulation: ATM-SNAP

    Traffic statistics:

     Input  bytes  :                    0

     Output bytes  :                    0

     Input  packets:                    0

     Output packets:                    0

    Local statistics:

     Input  bytes  :                    0

     Output bytes  :                    0

     Input  packets:                    0

     Output packets:                    0

    Transit statistics:

     Input  bytes  :                    0                    0 bps

     Output bytes  :                    0                    0 bps

     Input  packets:                    0                    0 pps

     Output packets:                    0                    0 pps

    Protocol inet, MTU: 4470, Flags: None, Generation: 31 Route table: 0

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 192.168.1.0/30, Local: 192.168.1.1, Broadcast: Unspecified, 
Generation: 59

    VCI 1.100

      Flags: Active

      Total down time: 0 sec, Last down: Never

      ATM per-VC transmit statistics:

       Tail queue packet drops: 0

      Traffic statistics:

       Input  bytes  :                    0

       Output bytes  :                    0

       Input  packets:                    0

       Output packets:                    0

What It Means

Sample output 1 shows the error statistics for an OC-3 ATM interface. SONET alarms and errors fall into three different areas of the output: section, line, and path. See Locate SONET Alarms and Errors for information on SONET alarms.

Sample Output 2

user@host> show interfaces at-3/1/0 extensive    

Physical interface: at-3/1/0, Enabled, Physical link is Up

  Interface index: 57, SNMP ifIndex: 66, Generation: 56

  Description: customer

  Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, Speed: T3, Loopback: 
None,

  Payload scrambler: Disabled, Mode: C/Bit parity, Line build-out: 10, ATM 
Encapsulation: PLCP

  Device flags   : Present Running

  Link flags     : None

  Hold-times     : Up 0 ms, Down 0 ms

  Statistics last cleared: 2002-07-30 15:36:58 UTC (00:00:02 ago)

  Traffic statistics:

   Input  bytes  :               270798              1067704 bps

   Output bytes  :              2260295              8911952 bps

   Input  packets:                 2001                  986 pps

   Output packets:                 2506                 1235 pps

  Input errors:

    Errors: 0, Drops: 0, Invalid VCs: 0, Framing errors: 0, Policed discards: 0, 
L3 incompletes: 0,

    L2 channel errors: 0, L2 mismatch timeouts: 0

  Output errors:

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

  Active alarms  : None

  Active defects : None

  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

    YELLOW                    0            0  OK

    EXZ                       0            0

    LCV                       0            0

    PCV                       0            0

    FERR                      0            0

    LES                       0

    PES                       0

    PSES                      0

    SEFS                      0

    UAS                       0

  PLCP defects:         Seconds        Count  State

    LOF                       0            0

    YELLOW                    0            0

  ATM defects:          Seconds        Count  State

    LCD                       0            0

  ATM status:

    HCS state:     Hunt

    LOC      :       OK

  PLCP statistics (errored seconds):

    Framing errors               : 0(0)

    Bit interleaved parity errors: 0(0)

    Far end block errors         : 0(0)

  ATM Statistics:

    Uncorrectable HCS errors: 0, Correctable HCS errors: 0, Tx cell FIFO 
overruns: 0,

    Rx cell FIFO overruns: 0, Rx cell FIFO underruns: 0, Input cell count: 7716,

    Output cell count: 191980, Output idle cell count: 144302, Output VC queue 
drops: 0,

    Input no buffers: 0, Input length errors: 0, Input timeouts: 0, Input 
invalid VCs: 0,

    Input bad CRCs: 0, Input OAM cell no buffers: 0

  PFE configuration:

    Destination slot: 3

    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 at-3/1/0.0 (Index 25) (SNMP ifIndex 85) (Generation 44)

    Flags: Point-To-Point Inverse-ARP SNMP-Traps Encapsulation: ATM-SNAP

    Traffic statistics:

     Input  bytes  :               270798

     Output bytes  :              2260295

     Input  packets:                 2001

     Output packets:                 2506

    Local statistics:

     Input  bytes  :                    0

     Output bytes  :                    0

     Input  packets:                    0

     Output packets:                    0

    Transit statistics:

     Input  bytes  :               270798              1067704 bps

     Output bytes  :              2260295              8911952 bps

     Input  packets:                 2001                  986 pps

     Output packets:                 2506                 1235 pps

    Protocol inet, MTU: 4470, Flags: None, Generation: 51 Route table: 0

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.10.65.176/30, Local: 10.10.65.177, Broadcast: 
Unspecified, Generation: 88

    VCI 0.5

      Flags: Active, Inverse-ARP

      Total down time: 0 sec, Last down: Never

      ATM per-VC transmit statistics:

       Tail queue packet drops: 0

      Traffic statistics:

       Input  bytes  :               270798

       Output bytes  :              2260295

       Input  packets:                 2001

       Output packets:                 2506

What It Means

Sample output 2 shows the error statistics for a T3 ATM interface. See Locate T3 Alarms and Errors for information on T3 alarms.

Table 24 describes the input and output errors that appear in the extensive output for an ATM interface.

Table 24: ATM Interface Input and Output Errors

Error	Description	Reason for Error
Input Errors
Errors	Sum of the incoming frame aborts and frame check sequence (FCS) errors.
Drops	Number of packets dropped by the output queue of the I/O Manager ASIC.	If the interface is saturated, this number increments once for every packet that is dropped by the ASIC's random early detection (RED) mechanism.
Invalid VCs	Number of cells that arrived for a nonexistent virtual circuit (VC).
Framing errors	Sum of ATM Adaptation Layer (AAL5) packets that have FCS errors, AAL5 packets that have reassembly timeout errors, and AAL5 packets that have length errors.
Policed discards	Frames that the incoming packet match code discarded because they were not recognized or of interest.	Usually, this field reports protocols that the JUNOS software does not handle, such as the Cisco Discovery Protocol (CDP).
L3 incompletes	Number of packets discarded due to the packets failing Layer 3 header checks.	Increments when the incoming packet fails Layer 3 (usually IPv4) sanity checks of the header. For example, a frame with less than 20 bytes of available IP header would be discarded and this counter would increment.
L2 channel errors	Errors that occurred when the software could not find a valid logical interface for an incoming frame.	This counter increments when the software cannot find a valid logical interface for an incoming frame.
L2 mismatch timeouts	Count of malformed or short packets.	Count of malformed or short packets that cause the incoming packet handler to discard the frame as unreadable.
Output Errors
Carrier transitions	Number of times the interface went from down to up.	This number should not increment quickly and should increase only when the cable is unplugged, the far-end system is powered down and up, or a similar problem occurs. If it increments quickly (perhaps once every 10 seconds), then the cable, the far-end system, or the Physical Interface Card (PIC) is broken.
Errors	Sum of the outgoing frame aborts and FCS errors.
Drops	Number of packets dropped by the output queue of the I/O Manager ASIC.	If the interface is saturated, this number increments once for every packet that is dropped by the ASIC's RED mechanism.
Aged packets	Number of packets that remained in shared packet SDRAM for so long that the system automatically purged them.	The value in this field should never increment. If it does, it is most likely a software bug or possibly broken hardware.

Table 25 lists ATM media-specific alarms and defects that can render the interface unable to pass packets. When a defect persists for a certain amount of time, it is promoted to an alarm. Based on the router configuration, an alarm can ring the red or yellow alarm bell on the router or trigger the red or yellow alarm LED on the craft interface. For complete explanations of most of these alarms and defects, see Chapter 6 in GR-253, Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria.

Table 25: ATM Active Alarms and Defects

Alarm	Description
AIS	Alarm indication signal
- AIS-L	Alarm indication signal (line)
- AIS-P	Alarm indication signal (path)
BERR	Bit error rate
- BERR-SD	Bit error rate defect-signal degrade
- BERR-SF	Bit error rate fault-signal fail
EXZ	Excessive zeros
FERF	Far end receive failures
IDLE	Idle code detected
LCD	Loss of cell delineation
LCV	Line code violation
LOC	Loss of cell delineation
LOF	Loss of frame
LOL	Loss of light
LOP	Loss of pointer
LOS	Loss of signal
PLL	Phase-locked loop out of lock
PLCP_LOF	Loss of PLCP frame alarm
PLCP_YLW PLCP	Alarm at the remote end
PLM-P	Payload label mismatch
RDI	Remote defect indication
- RDI-L	Remote defect indication (line)
- RDI-P	Remote defect indication (path)
REI	Remote error indication
SEF	Severely errored frame
UNEQ	Unequipped
YLW	Remote defect indication (yellow alarm)