What Information About a Created VPN Can Be Modified and What Information Cannot Be Modified?

VPN gateway
- You can modify the following information:
  - Name
  - Local subnet
  - Billing mode (yearly/monthly or pay-per-use)
  - Active and standby EIPs
    - To modify the active or standby EIP, unbind the original EIP and bind a new one.
      If a VPN connection has been created for an EIP, the EIP cannot be unbound.
    - You can modify EIP attributes, such as the name, type, and bandwidth. For details, see the EIP service documentation.
  - Specification
    The supported specifications are subject to those displayed on the management console.
  - Number of VPN connection groups
    The number of VPN connection groups needs to be specified only when Billing Mode is set to Yearly/Monthly.
- You cannot modify the following information:
  - Region
  - Association mode (VPC or enterprise router)
  - Enterprise router
    The associated enterprise router needs to be specified only when Associate With is set to Enterprise Router.
  - VPC
  - Interconnection subnet
  - BGP ASN
  - AZ
Customer gateway
- You can modify the following information:
  - Name
- You cannot modify the following information:
  - BGP ASN
    The BGP ASN needs to be specified only when Routing Mode is set to Dynamic (BGP).
  - Gateway IP address
VPN connection
- You can modify the following information:
  - Name
  - Billing mode. Only pay-per-use billing can be changed to yearly/monthly billing.
  - Local interface address
  - Customer gateway
  - Customer subnet
  - Policy configuration, including IKE and IPsec policies
  - Policy
  - PSK
  - Branch interconnection
- You cannot modify the following information:
  - VPN gateway
  - EIP
  - VPN type (route-based or policy-based)
  - Routing mode (static or BGP)
    The routing mode needs to be specified only when VPN Type is set to Route-based.
  - Link detection configuration
    The link detection configuration is available only when VPN Type is set to Route-based.
  - Policy configuration, including the source and destination CIDR blocks
    The policy configuration is available only when VPN Type is set to Route-based.