The initiator router interface can initiate the connection between two router interfaces. You only need to initiate a connection in the scenario of multi-tenant router interface interconnection, such as multi-tenant VPC interconnection and multi-tenant physical access.
Log on to the Express Connect console.
In the left-side navigation pane, select VPC Connection > Router Interface.
Click Initiate a Connection in the Actions column of the router interface.
In the displayed dialog box, click OK.