[c-nsp] Spanning tree compatibility with RSTP

[Joe Freeman]

I've seen serious problems with RSTP between Foundry and Cisco. When the
Foundry sees a PVST bpdu, it will automagically fall back to PVST mode on
the port it saw the BPDU on... there's no way in current code to disable it.

Joe

On 11/27/06, nealr <neal at lists.rauhauser.net> wrote:
>
>
>
>   Suggest you proceed carefully on this one - I've seen swarms of HP
> switches brought to a screeching halt by prestandard BPDUs coming out of
> WS-C3550, WS-C3750 with hardware level bugs such that they run correctly
> but fail to report their states properly, etc, etc, and I am *not* well
> versed in the protocol - seems like every time I see it the situation
> turns into a big bug hunt.
>
>
>
> Collins, Richard (SNL US) wrote:
> > Hello,
> >
> > I have some switches which are to be connected with some third-party
> > equipment which runs only classical RSTP.
> >
> > What is the recommended procedure - go to mst mode and set all vlans to
> > one MST instance and match the timers with the third party RSTP?  Can
> > one still run with multiple MST instances?
> >
> > SUP720(config)#spanning-tree mode ?
> >   mst         Multiple spanning tree mode
> >   pvst        Per-Vlan spanning tree mode
> >   rapid-pvst  Per-Vlan rapid spanning tree mode
> >
> > Thanks
> > Rich
> >
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