[nsp] single-col, multi-col, 6509

[Stephen J. Wilcox]

Some background!:

In half-duplex ethernet runs CSMA/CD to tx and rx on the same wire and detect
for collisions, basically what happens is the ethernet controller waits for the
line to be emtpy then transmits its frame, when its finished it listens to hear
if anyone else has accidentally started to transmit. If it decides another
device has transmitted it calls it a collision, sends out a jam signal to let 
the other network devices know and then waits a bit before retrying.

Now,
Single means it tried to transmit a frame but got a collision..

Multiple means the same as above except when it tried the second time there was 
another collision.

Its generally accepted that the singles are normal and to be expected but 
multiples indicates the network is overloaded.

But! You also get collisions if you have a duplex mismatch, are you sure the 
switch port is supposed to be running half duplex or auto duplex? If the other 
device is set to forced full duplex then the switch will get collisions and the 
other device will get FCS (frame checksum) errors. If you think this is the case 
set the port to full duplex (set port dup x/y full)

Steve

On Mon, 22 Mar 2004, matthew zeier wrote:

> 
> I can't (easily) find from cisco's site what Single-Col and Multi-Col mean.
> I do know that on this port each are increasing.
> 
> Port  Single-Col Multi-Coll
> ----- ---------- ----------
>  9/11     634745     100903
> 
> 
> --
> matthew zeier                        | "Nothing in life is to be feared.
> InteleNet Communications, Inc.       |  It is only to be understood."
> (949) 784-7904                       |       - Marie Curie
> 
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