we have FP activated in our datacenter and use Cisco Nexus (5,6,7)k. I'm not
sure what caused the problem but NAV can't find MAC-addresses on these
devices and even on catalysts behind them anymore. I don't know what
algorithm is used to figure out where a MAC-address is attached but maybe
someone who knows can clarify what is needed for that to work?
Not being a network engineer, I have no experience with FabricPath. I
had to Google it, and from what I could glean from [1], it appears
FabricPath throws traditional layer 2 bridging off the boat.
NAV collects MAC addresses from the forwarding tables in your switches.
It appears that Cisco FabricPath doesn't using forwarding tables, but
instead employs a proprietary system for routing ethernet frames.
In light of that, there is nothing the current version of NAV that will
help you get layer 2 information out of this proprietary system. Cisco
may have some MIBs available to get the relevant information, but I
could not say how/when or if we would put support for in on our roadmap.