Got a new job 2 weeks ago and we have 2 Cisco 5520 Wireless Controllers. I have been doing some network investigation and I see packets dropping on the wireless every so often. I think it might be that the APs are jumping between the two controllers not knowing which one should be primary and which one secondary. The controllers don't seem to be talking to each other at all. We have dual Nexus 9k core. Is the correct way to get these going well and redundant to put port channels on the 9ks? Anyone else have more experience than me to point me in the right direction to get these talking?
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