An engineer configures two Cisco ACI leaf switches called Leaf1 and Leaf2 as VPC peers. The server called S1 is connected to Leaf1 with a port channel interface. How is S1 learned in the endpoint table of Leaf2?
When two Cisco ACI leaf switches (Leaf1 and Leaf2) are configured as vPC peers, and a server (S1) is connected to Leaf1 via a port channel, S1 is learned in the endpoint table of Leaf2 as an "on-peer endpoint."
The on-peer endpoint is a variant of the remote endpoint. These endpoints are remote endpoints that point to a port that is not part of a virtual Port Channel (vPC), also called an orphan port, on a vPC peer leaf. They are special endpoints because they are remote, but they are learned through vPC synchronization on the control plane instead of through data-plane learning from the actual traffic. As a result of vPC synchronization, on-peer endpoints have MAC address, IP address, and EPG information, unlike other remote endpoints, which have either bridge domain (MAC address) or VRF (IP address) information.
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