how to avoid collision in ethernet port

Unanswered Question
Jul 18th, 2008

In my cisco router having ethernet port

that has lot of collision.. how to avoid these collisions.

I have this problem too.
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Jerry Ye Fri, 07/18/2008 - 07:59

Have you check the port duplex setting? If it is Half Duplex, it will be a lots of collision. Bad media - port or cable, can cause a lot of collision also.

HTH,

jerry

Richard Burts Fri, 07/18/2008 - 09:09

vinoth

The only way to fully avoid collisions is to operate the Ethernet in full duplex. There are no collisions in full duplex.

If you operate the Ethernet in half duplex there will be some collisions. Some collisions are normal in half duplex and are not a problem. What can be a problem is too many collisions. If you look at the total number of frames on the interface and look at the number of collisions you can get the ratio of collisions and that can help you to determine if you are having too many collisions.

HTH

Rick

Joseph W. Doherty Sat, 07/19/2008 - 04:31

Some additional notes:

Not all devices support full duplex Ethernet, e.g. old equipment and 10 Mbps Ethernet.

Duplex mode, to work correctly, must be the same between the two devices.

Many newer Ethernet devices support an "auto" duplex mode, but it can sometime fail to function properly. It will also usually revert to half duplex expecially if the other side is configured "full" -- which causes very poor performance.

Valid duplex configuration combinations between devices are half-half, full-full or auto-auto. (Auto-auto usually should bring the two devices interfaces to full-full, but it might set them to half-half. The latter is less than optimal performance, but again, you don't want to see half-full, whether hard configured that way or set that way by auto-auto.)

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