We use 4 VDCs, each of them having one ore more FEX. Routing is done using EIGRP, some BGP is remaining for outside connections, and a lot of static routes. The design is 4 N77710 chasis, 2 in each datacenter. The 2 in each datacenter forming a vpc domain. There is ofcourse a lot of planning in this. I did not yet think of the snapshot and maintenance mode. I will take a look into that to see what it can do. Still strange that documentation would state a ISSU path, but if more upgrades are needed a coldboot upgrade would be advised, can't yet wrap my head around that.
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