When you configure vPC on Cisco Nexus switches, vPC keepalive link is used by the two vPC peers to detect the liveliness of each other. The vPC keepalive plays a critical role of resolving a dual-active (aka split brain) scenario when the vPC peer link is down. This article presents different interface options of configuring vPC keepalive link on Nexus 5000 and discusses their pros and cons.
