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VALERIE LOISEL
Beginner

speed negociation delay

I've got an infrastructure with gigabit 4500 switch and connected machines.

Machines connected with standard twisted cable (4 pairs) works fine and negociate quite instantly to G : no problem.

When have to split one plug and connect 2 machines (2 paris for each), the speed is negociated to 100M full : no problem concerning the speed, but it seems that the process of the negociation itself is quite long and so, the port makes quite a long time to come up (up to 10-20 seconds).

The problem is that when I fix the speed on the switch port, the connection does not work (speed is configured in auto mode on my machines and I cannot change that).

Is there any possibility to decrease this delay of speed negociation ?

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Joseph W. Doherty
Hall of Fame Expert

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The problem is that when I fix the speed on the switch port, the connection does not work (speed is configured in auto mode on my machines and I cannot change that).

What might be the cause of that, many of the newer ports are also auto MDI/MDI-X when auto is enabled but not when auto is disabled.  Try swapping tx/rx pair.