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On Tue, Oct 28, 2014 at 08:32:11, Li Tianqing wrote:
> One more question.
> Vxlan use udp, how can vxlan promise reliability.
> 

It can't, but that doesn't matter.

VXLAN emulates a single layer 2 broadcast domain: conceptually, a series of machines all plugged into the same Ethernet switch. This kind of network *isn't* reliable: you can lose Ethernet frames. There's no reason to require reliability from VXLAN, and it would increase VXLAN's overhead to add it in. If you need reliability, the encapsulated transport will provide it for you exactly as it does on a non-encapsulated network.