[c-nsp] Cisco and Foundry and MST

[Loughlin, Daniel J.]

I would lean towards the MIST (802.1s) route, as well. However, you
might be interested to know that Foundry will also speak PVST+ with your
ciscos. If you want to also do rapid spanning tree along with PVST+
there is a gotcha... Foundry has rstp and 802.1w. Use the 802.1w
commands! Ignore the rstp stuff. It's non-standard stuff that happened,
I believe, before 802.1w was standardized. So be aware! Another thing
you'll get mad at is the show commands :). After enabling 802.1w on your
vlans, "show span" won't give you the information you need. You'll need
to type "show 802.1w".


Foundry-switch(config-if-e1000-1)#pvst-mod? 
  pvst-mode                     Interoperate with Cisco PVST+ for
                                multi-spanning tree

You'll put spanning-tree 802-1w under each vlan... for example...

vlan 1 name DEFAULT-VLAN by port
 spanning-tree 802-1w


I hope I didn't leave anything out... 

-Danny

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Ian MacKinnon
Sent: Thursday, March 26, 2009 1:00 PM
To: Nick Griffin; cisco-nsp
Subject: Re: [c-nsp] Cisco and Foundry and MST

Hi Nick,
I did something similar a while ago, so here are some thoughts.

Plan for downtime :-(
Don't expect it to be totally transparent, so make the changes in a
maintenance window.

I think SXH and later do a real standards compliant version of MSTP with
interop with standard STP.
Are you planning to use multiple instances, or just use one?
Make sure that your instance 0 (ie the STP) is the same on both sides,
and if you are only using one instance ensure it is 0 on both sides.

Be aware of the differences between Cisco RSTP and A.N.Other Spanning
tree in rapid mode.

I realise I am teaching you to suck eggs here, but plan what devices are
going to be the root and backup, and manually configure them.

Hope this is useful.
Ian


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Nick Griffin
> Sent: 26 March 2009 16:48
> To: cisco-nsp
> Subject: [c-nsp] Cisco and Foundry and MST
>
> I'm working with a client that is migrating to Foundry from Cisco and
> they
> need to have interoperability on STP between the two vendors. I
usually
> try
> to do MST when I can, usually in a cisco environment, so I'm pretty
> comfortable with it. Does anyone have any experience getting the 2 to
> play
> together? It's a critical environment, so minimal disruption is
> required.
> There is a core 6500 that can connects to a number of Cisco access
> switches,
> the Cisco 6500 also connects into the Foundry FESX switches. I wanted
> to go
> ahead and enable MST on the core 6500, and then working my way to the
> access
> layer (assuming the interoperability works just fine), and then the
> Foundry
> boxes. Just looking for any pro-pointers here to try to avoid baptism
> by
> fire! Thanks in advance.
>
> Nick Griffin
> Systems Consultant, CCIE R&S 17381
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