HIGH AVAILABILITY + STACK Config SETUP

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Hi Guys in line with my post weeks ago. https://www.reddit.com/r/networking/comments/bbjw5s/need_advise_for_this_setup/

I've decided to finalize the network upgrade with this setup thanks to s /u/golle i will run stack on the two switch instead.

. See topology below.

https://imgur.com/a/20HDcpQ

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Now im still unsure if understand stack concept properly.

I assume stacking is the same as HA in fortinet ? with both device as active active. So if i use for example of SW1-TG1 for specific config SW2-TG1 will adopt the same config and role as SW1-TG1 so i cant be use anymore in different role?

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And also since im planning to run port channel on the access-SW connecting to the STACK-SW with only 2 physical links can i do it this way? (refer to diagram)

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Notes:

since WS-C3850-24T does not support 4+ 10 G modules we're planning to get 2 WS-C3850-24XS instead.

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Thank you very much,