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UPLINK Problem

My Network is two 6500 series switch one of them run CATos the problem start when upgrading when of them to run IOS and  change the supervisor engine to a new one the active is the one run IOS and the standby is the Catos we have in both fibre module that run up link to the edge switches anf the core switches.

the problem :

we start to face slow network response on random edge switches connected to the fibre of the active core and so on with other switches,so we have checked everything nothing worng or any modification have been done no erridisable port no errors we have changed hardware checking bugs follow all the solution monitor the network ,when I put a crossover cable between on of the switches and the BB it eorks fine I am confused I appreciate your helps,regards

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