I have MSTP mesh topology and and I want to izolate two switches which connects to provider side I mean when MSTP calculating I don't want it dissconect or reset links that connected to ISP side because I have connection which must not being interrupted.
So here is topoloy pic
Could someone tell me how can I izolate two switches which in ISP side and another that connected to ISP side switch
You can use 2 MSTP's regions etc but some more information of what exactly you are trying to do would be good? When you say isolate Are you saying that the switches should not talk to each other ? What are you using the interconnect trunk link between the local switches for?
I don't want disturb that switches which interconnect ISPs I have lots of switches in my local and when making changes it start calculating then it reset conectivity thats why I want to exclude that switches from being calculating or participating in MSTP process by the way I use VTPversion 3 with MSTP
and what do you think will mstp new region help me or I should try smth else?
because only two switches I want to not participating
I have configured Ipsec HA to multiple ISPs for important services it Happend twice when adding new switch or instance to MSTP it resets conectivity
Now I understand better - at least I believe. You may be experiencing outages caused by MSTP Proposal/Agreement mechanism propagating from the point of a topological change down to your links with ISP, but with nobody to answer the Proposal from the ISP with an Agreement, these links remain blocked for 30 seconds after certain topological changes.
A possible solution would be to use the command spanning-tree portfast trunk on the interface that is the closest to your ISP and connects your network to the ISP. This will forcibly declare the port as an edge port that is not influenced by Proposal/Agreement processes.
Another spanning-tree portfast default global level configuration command should also be used on all your switches in your network to make sure that access ports are treated as edge ports (ports connected to end devices rather than other switches) and hence are also not influenced by topological changes.
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