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cisco sg550xg-24t connected to safenet cn4020

Hello,

I have two cisco sg550xg-24t's which is need to connect to two safenet cn4020 encryptors.

I have connected the devices however the leds on the switch dont appear to light up and under the ports it shows that the port is down.

I have connected the safenet devices together via a crossover cable and they appear to work correctly however when i connect them to the switch it doesn't bring up the interface.

Is there something i could be missing ? I'm aware that these switches use 'smart ports' which is have tried turning off however this doesnt make any difference , i also noted that perhaps the switch needed it's MTU value for the port lowered however there is no option to do this.

Any other troubleshooting tips would be appreciated!

Thanks 

John 

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