topic Re: How many MSTP instances are good for less CPU utilization & faster performance in exos in ExtremeSwitching (EXOS/Switch Engine)

How many MSTP instances are good for less CPU utilization & faster performance in exos

ddpatil89 — Mon, 26 Oct 2020 12:31:36 GMT

We are migrating from 2 cisco core to extreme exos x670-g2 (2 stacked x670-g2). In present customer setup we have 60 vlans with PVST running. As extreme does not support pvst we are planning to migrate from pvst to mstp. So please let me know how many instances should I configure in extreme & how many vlans per instance in order to achieve less CPU utilization & faster performance?

Re: How many MSTP instances are good for less CPU utilization & faster performance in exos

Miguel-Angel_RO — Mon, 26 Oct 2020 15:08:20 GMT

ddpatil89,

Exos does support PVST+ except for the native vlan:

https://gtacknowledge.extremenetworks.com/articles/Q_A/Does-EXOS-support-PVST-on-the-native-vlan-of-Cisco

For what concerns the # of MSTP instances, it will depend on your network designs and requirements.

Mig

Re: How many MSTP instances are good for less CPU utilization & faster performance in exos

FredrikB — Thu, 05 Nov 2020 22:00:01 GMT

Do you really need spanning tree in this day and age? Perhaps you should consider another networking topology? I do understand that it’s a necessary evil at times (I configured a handful switches in China yesterday and had to do it using RSTP) but I would certainly consider breaking up the MSTP/PVST+ network as much as I could and use LAG/MLAG and CWDM/DWDM or even just BiDi SFPs as a means to enable that.