Before using Express Connect, we recommend that you understand the limits.

Resource Default limit
Maximum number of VBRs that can be created on a physical connection 5
Maximum number of physical connections that an account can access at an access point 2
Maximum number of idle VBRs (VBRs without interfaces) under an account 5
Maximum number of peering connections that can be created for a VPC 10
Maximum number of peering connections that can be created for a VBR 10
Maximum number of peering connections that can be created by an account 20
Maximum number of route entries that can be added to a VBR 48
Maximum number of BGP route entries that can be accepted by a VBR 110
We recommend that you use private CIDR blocks for a VBR and VPC to communicate with each other. The CIDR blocks cannot conflict with each other.
After you use Express Connect to connect VBRs or VPCs, you cannot use CEN any more.
If you use dual physical connections to access Alibaba Cloud, you must configure health check so that traffic is distributed to the standby link when the active link fails.