[j-nsp] STP Between Cisco and Juniper

[Saba Sumsam]

Hi,
Thanks a lot for your comments.

The topology is pretty simple. A single VLAN between the following devices,
with users connected to the Cisco switches using a VRRP gateway between
SRX100 & SRX210.

[image: Inline image 1]

It's strange that the SRX210 doesn't support MSTP - so can't go for MST
between all devices.

Regards.


On Sat, Nov 10, 2012 at 5:38 PM, Jonathan Lassoff <jof at thejof.com> wrote:

> On Fri, Nov 9, 2012 at 9:57 PM, Saba Sumsam <saba+jnsp at eintellego.net>
> wrote:
> > Hi,
> > I have a Layer 2 network consisting of a Cisco 2970G, SRX210 and SRX100.
> > Following are the STP modes supported on each:
> >
> > Cisco 2970G: mst, pvst, rapid-pvst
> > Juniper SRX100: STP, RSTP. MSTP
> > Juniper SRX210: STP, RSTP
> >
> > My question is: Is Cisco mst interoperable with Juniper RSTP. What mode
> > should I be using on each device in this case?
> >
> > Suggestions highly appreciated.
>
> The best solution will really depend on your environment.
> What is the topology like?
>
> I would avoid MST/MSTP unless you have a good reason to use it. A
> Cisco running MSTP should interoperate with non-MSTP-speaking devices,
> as external to MSTP-speaking boxes, each "region" looks like like a
> big spanning-tree bridge.
>
> If your environment is simple and doesn't have any unusual
> requirements, I would go for rapid-pvst/rstp on each device.
>
> Cheers,
> jof
>
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