Questions about datacenter switching and TRILL In a interconnection of two datacenters, Is TRILL a long-term solution ? Is the TRILL implementation of Cisco (FabricPath) interoperable with other manufacturer ?

There are three TRILL-ish implementations out there that I'm aware of:

* FabricPath from Cisco - correct routing protocol (IS-IS), wrong encap format;
* VCS Fabric from Brocade - correct encap format, wrong routing protocol (FSPF);
* TRILL from HP - seems to be OK



So there is at the moment ZERO inter-vendor interoperability.

And as others said - if someone held a gun to my head and told me to do L2 DCI, I would try to use OTV first (it's also available on ASR 1K), failing that, TRILL would be second least horrible option.