A physical connection is the abstraction of the network circuits established between an Alibaba Cloud access point and your on-premises data center. To establish a physical connection, you have to apply for a leased line. A leased line is a cable rented from a network carrier that connects your on-premises network to an Alibaba Cloud access point.
With this leased line in place, you can create a virtual border router (VBR) to connect your on-premises IDC to Alibaba Cloud to build a hybrid cloud environment. Therefore, the cloud resources can access your on-premises network bypassing the Internet over a private network connection.
The physical connection does not go through the Internet. It is more secure, reliable, and fast with lower latency than typical Internet connections.
The physical connection provides the following functions:
Multiple connectivity models
You can choose to use a point-to-point Ethernet connection or an MPLS VPN connection Physical connection supports Ethernet RJ45 electrical ports and LC-mode optical ports with 1 Mbps - 10 Gbps transmission rate.
Physical connection uses the equal-cost multi-path routing (ECMP) to achieve redundancy of two leased lines:
If the two leased lines connect to different access points in a same region, then these two leased lines are redundant by default.
If the two leased lines connect to the same access point in a same region, you can select the first leased line as the redundant connection when applying for the second leased line.
The following are physical connection limitations:
Physical connections do not support SDH G.703 or V.35 interfaces.
Alibaba Cloud provides one or more access points in each accessible region. Different access points have different carrier restrictions. Before applying for leased line access, you must open a ticket to obtain the access point and carrier restriction information.