• The default route table of a VPC cannot be deleted.
• After a VPC is created, its route table will be automatically provided with a default route, indicating that all resources in this VPC are interconnected through the private network. This routing policy cannot be modified or deleted.

• Dynamic routing protocols such as BGP and OSPF are not supported.
• The support for ECMP varies with routes, as shown in the following table.

Note：

• Equal Cost Multi-path (ECMP) means there are multiple equal-cost routes to a single destination.
• That public IP of CVM has a higher priority than that of NAT Gateway when routing to the same destination.
• Because of different priorities, EIP and other types of routes are not considered for ECMP.
• Direct connect gateway and CCN can form ECMP. However, it will not check the route’s health status, or automatically exclude unhealthy routes. To form ECMP with CCN, first submit a ticket.
• Multiple NAT Gateway routes can form ECMP. However, it will not check the route’s health status, or automatically exclude unhealthy routes.
• Multiple CVM routes can form ECMP. However, it will not check the route’s health status, or automatically exclude unhealthy routes.

• Routes can be published to CCN.
  The following routes can be published to CCN.

Note：

• A disabled custom route cannot be published to CCN.
• To disable a custom route that has been published to CCN, first withdraw it.

Quota Limits