Portfast won't go away!

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May 4th, 2010
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I have a 2950 switch in a remote site that has 2 3Com 8 port switches connected to it to secondary rooms.  I keep getting notified that these switches stop working.  I checked the 2950 and portfast was enabled, I issued "no spanning-tree portfast" on both ports, saved the config.

A couple of days later (after a power outage) the same thing happened.  I logged in, and "spanning-tree portfast" was back on both interfaces!

I've repeatedly removed this from the config and it keeps coming back.  I don't understand why.


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Rajeev Sharma Tue, 05/04/2010 - 11:56
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Hi Rob,

Seems weired to me.


Do you have port fast globally enabled?

What is the runnnign IOS on the box?


Jon Marshall Tue, 05/04/2010 - 11:58
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Do you have "spanning-tree portfast default" configured in global configuration mode ?

If so then you need to use this command under the interface -


spanning-tree portfast disable


rcoote5902_2 Tue, 05/04/2010 - 12:04
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That's the funny thing...I don't have it enabled globally.

I added "spanning-tree portfast disable" to those two ports and it looks like it stuck after a reload.

Time will tell I suppose...


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