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SG Switch UPlink issue

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why i a unable to terminate up link on port 1-24. it is working only port 25 but internet is too slow.

when i terminate it on other it goes up and down 

what is the model of SG, what kind of cable termination ?

 

what is other device connecting to ?

 

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Switch model is SG350-28-K9.
we create a lan port in fortinet firewall and want to terminate it on switch but it only work on port no 25.
when we try to terminate on other port it goes up and down contentiously.
we use Cat6 patch cord for connectivity.

SG350-28 concern

 

1-24 access ports, and 25-28 are uplink ports, depends on how you configured your switch to work.

 

When you mentioned connected to port 25 ,internet slow, that time what port your device connected, what is your DNS configuration ?

 

what happends if you connect directly to forigate directly with PC - is that work as expected ?

 

you need to step by step diagnosis to find the issue ?

 

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i did not configure the switch.
switch is new and we just place it on network.
if we connect direct cable to our switch through fortinet it works fine

you need to configure the switch :

 

here is quick start guide.

 

https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/350_/2_3/quick_start/guide/en-US/Cisco350-QSG-en-US.pdf

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