Re: Spanning-tree Alternatives

Thanks All,

Well we are using Layer 3 at distro.

Now when i say we have spanning-tree loops then it doesn't mean i am not
using spanning-tree enhancements like portfast, loopgaurd, bpdugaurd and so
forth. The problem is that no matter what you configure there are some
issues when spanning-tree fails completely even though you have configured
these things. We had a issue with a 3750 switches in stack. The way they
failed and caused issues is a corner case but it did happen in our network.
So i was looking for alternatives .

thanks
naman

On 2 June 2010 14:52, Tyson Scott <tscott_at_ipexpert.com> wrote:

> Usually when you have problems with spanning-tree is a poor implementation
> at the edge.
>
> Two things that I have done in the past that solved this at different
> companies.
> 1. Make a rule that no hubs on the network. We had auto scripts login to
> devices and shutdown ports if users attempted to plug in a hub. They had
> to
> call the help desk to get their port turned back on.
> 2. If you do allow hubs turn on bpduguard and turn off portfast for all
> ports connected to the hubs.
>
> You could even write expect scripts or use rancid to write the scripts to
> look for more than one mac on a port to turn of portfast.
>
> Taking the above steps solved the majority of spanning-tree problems in the
> organizations I worked in. I know it is just the basics but it is not
> usually the network infrastructure that has spanning-tree issues. It is
> the
> user introduced problems in my experience.
>
> Regards,
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
> Managing Partner / Sr. Instructor - IPexpert, Inc.
> Mailto: tscott_at_ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Laidlaw, Patrick A.
> Sent: Wednesday, June 02, 2010 5:09 PM
> To: naman sharma
> Cc: Cisco certification
> Subject: Re: Spanning-tree Alternatives
>
> If your having problems in your layer 2 network your probably not using
> spanning tree effectively. Your options are to either ensure that you
> don't have any alternate paths In your network. Or ensure you have spanning
> tree on.
>
> Sent from my iPad
>
> On Jun 2, 2010, at 1:02 PM, "naman sharma" <naman.prep_at_gmail.com> wrote:
>
> > Hi Experts,
> >
> > Just wanted to know what are the alternatives for spanning-tree in the
> > network. I am bogged down by the spanning-tree loops in the network. My
> > options are :-
> >
> > a) Implementing VSS. But i doesn't have the right hardware for that.
> > b) Bringing Layer 3 down to Access layer.
> >
> >
> > Does anyone has any other option.
> >
> > thanks
> > naman
> >
> >
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Received on Wed Jun 02 2010 - 22:23:34 ART