I have a number of switches on the network that are linked on the G0/1 port with a CX_GIGASTACK module.
I have numerous stacks throughout the network.
Some appear to be connecting at the following...
Auto-duplex (Full), 1000Mb/s, media type is CX_GIGASTACK (0 collisions)
And some connect at
Auto-duplex (Half), 1000Mb/s, media type is CX_GIGASTACK (56 collisions)
All switches are running the same OS Version 12.0(5)WC17
1.) Is there something configured wrong with the half duplex interfaces? I thought that is what these GigaStack modules connected at.
2.) They seem to be getting the collisions. In the switch above I cleared the counters and it started up again with the collisions (56) and just keeps climbing. Not at a fast rate but still goes up.
The stacks that connect at Auto-duplex (Full), 1000Mb/s do not seem to have any collisions.
This doesn't appear to be affecting the network in any way its just bugging me.
Thank you for your help.
Thanks for the rating.
>> The stacks that connect at Auto-duplex (Full), 1000Mb/s do not seem to have any collisions.
this is correct full duplex links should never see collisions
Conversely half-duplex links experience collisions this is normal: a collision causes a retrasmission at ethernet level.
if the collision rate is low this can be tolerated.
Be aware that performances are reduced to roughly 330 Mbps per direction.
About the ports negotiating 1000 half with normal ports you could try to force another negotiation with a shut/no shut cycle but I'm afraid here this is out of discussion.
Hope to help