[f-nsp] Rapid Spanning Tree too slow (like ordinary -not rapid - stp)

[Mike Allen]

The RSTP and 802.1w is pretty much interchangeable (from a config
standpoint) with the newer codes, the commands are not necessarily
consistent across all platforms (ie: some use rstp, some use 802.1w, some do
both) but it will interoperate.  The differences are pretty much on the CLI
only.

As for optimization, as the other two posters suggested, you need to set the
uplink (switch to switch connections) on both ends to admin point to point,
as shown in their replies.  Without that, the recovery will be slow.  With
it, I have seen failovers as short at 1 second, to a max of about 3-4
seconds.

Mike

On Tue, Jun 24, 2008 at 12:17 PM, Jethro R Binks <jethro.binks at strath.ac.uk>
wrote:

> On Tue, 24 Jun 2008, Gunther Stammwitz wrote:
>
> > My config is looking like this:
> > vlan 503 name FRA3-FCS by port
> >  tagged ethe 49 to 50
> >  untagged ethe 4
> >  spanning-tree rstp
> >  spanning-tree rstp priority 0
> >
> > I've already tried to use "spanning tree 802-1w" instead of rstp which
> > didn't help.
> >
> > this behavior can be seen on bigirons and netirons using jetcore/M4 and
> > irconcore/M3 as well as on the FI4802-switch on the router and the
> > switch-codetrees.
>
> One thing I can tell you is that 802-1w is what you need - that is 'real'
> RSTP.  Confusingly, the 'rstp' in the Foundry is one of the earlier drafts
> for RSTP.  See the documentation.
>
> You should also specify any non-shared media link (ie, not to a hub) as
> point-to-point, for example:
>
>  spanning-tree 802-1w ethe 1/1 admin-pt2pt-mac
>
> And that's about as far as my knowledge goes :)  But it works in the
> situations I've deployed it (BigIron, Super-X) like this, with topology
> change recovery times of 2 to 4 seconds, as expected.
>
> I'd be glad to hear any other optimisations people can suggest.
>
> Jethro.
>
> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> Jethro R Binks
> Computing Officer, IT Services
> University Of Strathclyde, Glasgow, UK
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>
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