[nsp] c1900 FCS errors

From: Deepak Jain (deepak@ai.net)
Date: Fri Nov 26 1999 - 22:06:40 EST


One of our internal C1900s is generating a bunch of FCS errors on its
100Mbit B port:

        Catalyst 1900 - Port B Statistics Report
    Receive Statistics Transmit Statistics
------------------------------------- -------------------------------------
Total good frames 134549 Total frames 116033
Total octets 93924939 Total octets 10939182
Broadcast/multicast frames 1 Broadcast/multicast frames 692
Broadcast/multicast octets 64 Broadcast/multicast octets 47891
Good frames forwarded 134549 Deferrals 0
Frames filtered 0 Single collisions 0
Runt frames 435 Multiple collisions 0
No buffer discards 0 Excessive collisions 0
                                       Queue full discards 0
Errors: Errors:
  FCS errors 4185 Late collisions 0
  Alignment errors 0 Excessive deferrals 0
  Giant frames 11 Jabber errors 0
  Address violations 0 Other transmit errors 0

---

This port is generating about 100-140 FCS errors per update interval (~1 sec) connected directly to a Sun Ultra @ 100MBit/s FD. The server is averaging about 10-20Mbit/s of traffic. Store and Forward was off, but then turned on after the Cisco site recommended using S&F to prevent FCS frames from being filtered.

What is wrong (if anything)? there seems to be a consensus that high speed connects can draw FCS errors.

Thanks,

Deepak Jain AiNET



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