Examine Output for Framing Errors

Purpose

By examining the output for an interface, you can determine if framing errors are incrementing in the absence of any SONET alarms or defects.

Action

From the JUNOS command-line interface (CLI) operational mode, use the following command to check for framing errors:

user@host> show interfaces interface-name extensive

Sample Output

user@router1> show interfaces so-1/0/0 extensive    

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

  Interface index: 13, SNMP ifIndex: 18, Generation: 12

  Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3, 
Loopback: None, FCS: 16, Payload scrambler: Enabled

  Device flags   : Present Running

  Interface flags: Link-Layer-Down 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 : 6 (last seen 00:00:52 ago)

    Output: 11 (last sent 00:00:05 ago)

  LCP state: Opened

  NCP state: inet: Opened, inet6: Not-configured, iso: Opened, mpls: 
Conf-req-sent

  CHAP state: Not-configured

  Last flapped   : 2002-11-01 22:28:30 UTC (1w5d 23:26 ago)

  Statistics last cleared: 2002-11-14 21:52:51 UTC (00:01:50 ago)

  Traffic statistics:

   Input  bytes  :                  692                    0 bps

   Output bytes  :                  716                   32 bps

   Input  packets:                   23                    0 pps

   Output packets:                   72                    0 pps

  Input errors:

    Errors: 0, Drops: 0, Framing errors: 27, Runts: 0, Giants: 0, Bucket drops: 
0, Policed discards: 0, L3 incompletes: 0,

    L2 channel errors: 0, L2 mismatch timeouts: 0, HS link CRC errors: 0, HS 
link FIFO overflows: 0

  Output errors:

    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0, HS link FIFO 
underflows: 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      : 0xcf, C2(cmp) : 0xcf, 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      : 0xcf, F2      : 0x00, Z3      : 0x00

    Z4      : 0x00, V5      : 0x00

  Received path trace: router2 so-1/3/1

    73 6c 69 70 70 65 72 79 20 73 6f 2d 31 2f 33 2f   router2 so-1/3/1

    31 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

    00 00 00 00 00 00 00 00 00 00 00 00 00 00 0d 0a   ................

  Transmitted path trace: router1 so-1/0/0

    68 61 69 72 79 20 73 6f 2d 31 2f 30 2f 30 00 00   router1 so-1/0/0

    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

  HDLC configuration:

    Policing bucket: Disabled

    Shaping bucket : Disabled

    Giant threshold: 4484, Runt threshold: 3

  Packet Forwarding Engine configuration:

    Destination slot: 1, PLP byte: 1 (0x00)

    CoS transmit queue             Bandwidth           Buffer Priority   Limit

                              %          bps   %        bytes

    0 best-effort            95    147744000  95            0      low    none

    3 network-control         5      7776000   5            0      low    none

  Logical interface so-1/0/0.0 (Index 8) (SNMP ifIndex 108) (Generation 9)

    Flags: Device-Down Point-To-Point SNMP-Traps Encapsulation: PPP

    Protocol inet, MTU: 4470, Generation: 15, Route table: 1

      Flags: Is-Primary

      Addresses, Flags: Dest-route-down Is-Default Is-Preferred Is-Primary

        Destination: 1.1.6.1, Local: 1.1.6.2, Broadcast: Unspecified, 
Generation: 15

    Protocol iso, MTU: 4470, Generation: 16, Route table: 1

      Flags: Is-Primary

    Protocol mpls, MTU: 4458, Generation: 17, Route table: 1

      Flags: Protocol-Down, Is-Primary

What It Means

The sample output shows that Router1 is configured for FCS 16, that framing errors have incremented to 27, and that there are no SONET alarms or defects. Incrementing framing errors, in the absence of any SONET alarms or defects, are a symptom of SONET frame checksum errors.