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1.Server B 向A发起请求后就能正常通讯，此时leaf 1应有Server B的remote EP表项，此时Server A 发起的流量到达Leaf1后查询到remote EP表象，直接抉择发给dst leaf。
2.有问题的时候，B没有发送请求，Leaf1应没有Server B的remote EP信息，此时流量需要进行spine proxy到达Spine进行查询抉择路径。
Because of spine proxy, Cisco ACI packet forwarding will ...
