[c-nsp] MST vs. RPVST+ - Question to scalability

[Chris Evans]

Yes you can put it all in one domain if you'd like. Rather large domain
IMHO, but is possible depending on how your topology is laid out. There is
a finite limit of how many devices can be cascaded.

When they speak of region they're talking about MST region. With MST you
need to have the configuration 100% the same or else it's considered a
different region. MST scales more because of less processes running on the
hardware.

On Thu, Jan 15, 2015 at 3:04 AM, Hansen, Ulrich Vestergaard (WP TE R&D MSD
SWS SCS SHW) <uvh at siemens.com> wrote:

> Hi
>
> Quick question, hope someone can chip in.
>
> We're currently struggling with RPVST+ hitting the max number of instances
> on a branch with 3750X switches (128 instances).
> Considering MST as an alternative, as the logical topology is anyway the
> same for all 128 instances.
>
> Reading some papers, Cisco recommends that you place as many switches as
> possible into a single region (
> http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html)
> but fails to mention how it actually scales. Can I add 200 access switches
> to one MST domain? 300? 400?
>
> Best regards
> Ulrich
>
>
>
>
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