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New Member

T3 CRC and overruns increase in lockstep

I have a Cisco router connected to a Juniper via T3, and there are periodic bursts of 100's of rx errors on the Cisco side. The salient feature is the CRCs and overruns increase in lockstep but other error counters are 0. The controller always shows clean, extended BERT testing shows clean and CPU is about 3%. Clock is set internal on the Juniper side and line on the Cisco side. I am stumped, anyone got an idea?

show int s1/0

  Last clearing of "show interface" counters 01:08:28

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  30 second input rate 5354000 bits/sec, 1027 packets/sec

  30 second output rate 46000 bits/sec, 108 packets/sec

     8418145 packets input, 4470176042 bytes, 0 no buffer

     Received 414 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 0 throttles

     3082 input errors, 3082 CRC, 0 frame, 3082 overrun, 0 ignored, 0 abort

sho control t3 1/0

  Total Data (last 24 hours)

     0 Line Code Violations, 0 P-bit Coding Violation,

     0 C-bit Coding Violation, 0 P-bit Err Secs,

     0 P-bit Severely Err Secs, 0 Severely Err Framing Secs,

     0 Unavailable Secs, 0 Line Errored Secs,

     0 C-bit Errored Secs, 0 C-bit Severely Errored Secs

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2 REPLIES
Hall of Fame Super Gold

Re: T3 CRC and overruns increase in lockstep

Ask telco if they provide clock on both sides.If so, set both sides to line clock.

New Member

T3 CRC and overruns increase in lockstep

Good thought, I assume you mean line clock....anyway tried it but no luck. Doesn't matter if both sides are line, both internal, or one of each, same error pattern.

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