We've got a stack of 5 dell switches connected to a cisco 10gig switch using 4 fibre interfaces in a port channel. On the dell side we had to specify 'speed 10000' on each fibre interface, the cisco side is as normal. It works fine.
The problem happens when the dell stack is rebooted, once rebooted we lose the fibre links. We tried adding the speed 10000 to the cisco switch interfaces it made no difference.
We can get the links back by, on the dell switch, removing each fibre interface from the port channel, removing the speed command from each interface, readding the speed command & then finally readding each interface to the port channel. This brings them back up everytime but is a right ballache.
Anyone got any ideas as to what we're doing wrong?
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