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Can anyone tell me why my cisco 3750 switch running rapid-pvst does a
fast convergence, when I plug in a server? The covergence affects all
devices on the switch to lose connection.

I thought that only the port that gets a connection should go to the
spanning tree convergence..not all of the ports?

Any help would be great..

W artykule < .com> napisa³(a):

> Can anyone tell me why my cisco 3750 switch running rapid-pvst does a
> fast convergence, when I plug in a server? The covergence affects all
> devices on the switch to lose connection.
>
> I thought that only the port that gets a connection should go to the
> spanning tree convergence..not all of the ports?

Put spanning-tree portfast on all interfaces you want to exclude from
spanning-tree topology.

TP

Ok but do I also have to configure BPDU guard and Filter?

<> wrote in message
news: oups.com...
> Can anyone tell me why my cisco 3750 switch running rapid-pvst does a
> fast convergence, when I plug in a server? The covergence affects all
> devices on the switch to lose connection.
>
> I thought that only the port that gets a connection should go to the
> spanning tree convergence..not all of the ports?
>
> Any help would be great..
>

I experienced this once with a 3750 (as well as the replacement that Cisco
sent). Turned out to be a software problem. Software image was
c3750-i5-mz.121-19.EA1c.bin Cisco never acknowledged an issue with the
release even though I reported it to them.

I'll be interested to hear what release you are using and if upgrading fixes
it.

Jim

W artykule < .com> napisa³(a):

> Ok but do I also have to configure BPDU guard and Filter?

bpdufilter statment filters out all bpdu messages on interface. It should
be only enabled on ports connected to single machine.

TP

Thanks indeed we have -> c3750-i5-mz.121-19.EA1c.bin

I think that's the problem.

[mamath]

Hello

I have made some tests with rapid pvst and pvst and I can't see that rapid pvst converge faster than pvst. Does anybody know why ?


An other thing, I have tested portfast bpduguard and it is wonderful for loops with a cross over cable but not useful for a loop because of an IP phone. how can I change this

thank you