Why the VSI cannot be Up when the switch connects to a Cisco device over the VPLS network

On a Cisco device, a Layer 3 interface or main interface that is bound to a VSI uses the Ethernet encapsulation mode, and a sub-interface that is bound to a VSI uses the VLAN encapsulation mode by default. On a switch, a Layer 3 interface, main interface, or sub-interface that is bound to a VSI uses the VLAN encapsulation mode by default. If the encapsulation modes on the switch and Cisco device are different, the VSI cannot be Up.

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