Notes and Constraints

Resource	Default Quota	How to Increase Quota
Number of connections that can be created by an account in each region	10	Submit a service ticket.
Number of virtual gateways that can be created by an account in each region	5	Submit a service ticket.
Number of virtual interfaces that can be created by an account in each region	50	Submit a service ticket.
Number of local subnets for a virtual gateway	50	Increasing the quota is not allowed.
Number of routes for BGP sessions on a virtual interface	100	Submit a service ticket.
Number of remote subnets for a virtual interface	50	Submit a service ticket.

Before creating a connection, you need to select a location. Note the following restrictions:

There may be more than one location in each region. In this case, network latency from each location to different AZs in the region should be less than 5 ms.
If your workloads have demanding requirement for network latency, you can submit a service ticket to confirm which location is the nearest to the AZ where your cloud servers are running.

The CIDR block of the VPC cannot overlap with the CIDR block used by the on-premises network.
The on-premises network cannot use 100.64.0.0/10, 127.0.0.0/8, 169.254.0.0/16, and 224.0.0.0/3 because they are reserved for the VPC service.
1GE and 10GE single-mode optical ports can transmit data up to 10 km. If you need an optical port to transmit data for more than 10 km, or you need a 40GE or 100GE port, you need to buy optical modules by yourself. For suggestions on optical module selection, submit a service ticket .
If you use a Direct Connect connection to access ELB, you must select Source IP hash as the load balancing algorithm and disable sticky sessions for ELB.
By default, Direct Connect is not interconnected with Enterprise Switch. To access Enterprise Switch using Direct Connect, submit a service ticket.
Direct Connect can respond to common ICMP packets (echo packets whose type is 8 and code is 0 and do not carry IP options) for ping detections.
For each connection, a maximum of 30 ping detections can be performed on the local gateway IP address over the port per second.
To connect on-premises data centers through enterprise routers, ensure that the on-premises data centers are connected to different devices. For details, submit a service ticket.
A virtual gateway can be associated with only two different devices.

Your construction company must comply with the regulations presented by the equipment room carrier and engineers. In case of any violation, the construction cannot be completed.
No optical-to-electrical converters can be hosted or installed in the equipment room.
Network blocking due to state policies or Huawei Cloud management will delay the construction. In the event of such situation, contact your Direct Connect manager.
The equipment room at a location is operated by a telecom carrier or a third party. If there are fees for connecting your leased line to the equipment room or an in-building cable, pay the fees to the equipment room carrier.
You need to apply for a Letter of Authorization (LOA) and present the LOA when entering the equipment room for construction.