I ran into this the other day. My customer had a Brocade ICX6450 acting as the core (I know, don't say it) and was trying to connect a Cisco 2960 via fiber to it. Well, the fiber link just wouldn't come up.
But, I knew there was something special that you did have to do when connecting a Cisco and Brocade together (sometimes) when you have issues like this. Turns out that I had to run this command on the Cisco port: "speed nonegotiate"
That resolved my problem and the link came right up.
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