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

Chris Evans chrisccnpspam2 at gmail.com
Thu Jan 15 09:50:47 EST 2015

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

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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