[nsp] Ethernet errors between 7500/PA-FE-TX and 3548XL switch

From: sthaug@nethelp.no
Date: Sat Jun 10 2000 - 19:55:04 EDT


We're seeing input errors (CRC) on 3548XL switch ports connected to 7500
routers with PA-FE-TX. No errors are visible on the 7500 side. We have
tried switching cables, 3548XL switches, and PA-FE-TX on the 7500s. And
we still get these errors. The amount is low, about 3e-4 - but higher
than we would expect. Typical view:

FastEthernet0/43 is up, line protocol is up
  Hardware is Fast Ethernet, address is 0001.9639.df2b (bia 0001.9639.df2b)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 3/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:54, output 00:00:00, output hang never
  Last clearing of "show interface" counters 23:26:33
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  30 second input rate 1478000 bits/sec, 388 packets/sec
  30 second output rate 337000 bits/sec, 319 packets/sec
     29933559 packets input, 2587487178 bytes
     Received 105393 broadcasts, 0 runts, 0 giants, 0 throttles
     8435 input errors, 8435 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 72052 multicast
     0 input packets with dribble condition detected
     26693614 packets output, 3845108664 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

The switches are running 12.0(5.1)XP or 12.0(5)XU, the routers 12.0(10)S.
If we change the switches to for instance Baystack 350, the errors stop.
I'm just wondering if I'm seeing real errors, or if this is a known bug
where the switches are counting something else as CRC errors.

Anybody else seen this?

Steinar Haug, Nethelp consulting, sthaug@nethelp.no



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