inserting ethernet cable long time activation

Unanswered Question
Mar 27th, 2009

How to fast ethernet ports on cisco for exemple 3750 ? They work after 30 seconds from inserting ethernet cable even when computer is with static IP !

I have this problem too.
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Giuseppe Larosa Fri, 03/27/2009 - 03:24

Hello Karol,

use

spanning-tree postfast in interface configuration mode

or the macro

switchport host

Hope to help

Giuseppe

Joseph W. Doherty Fri, 03/27/2009 - 04:57

Giuseppe's answer will likely correct the issue.

What can happen, STP can "block" a port when it first activates to avoid loops until it determines that it is safe to unblock the port.

Logically, I believe there are two cures. You inform the switch that the port can not be looped (which can be risky for user edge ports). Or, depending on the STP variant being used, you inform the switch to do the loop test much faster. (This latter, I believe, is what Giuseppe's recommendation does.)

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