Scenario

VPN tags are used to identify VPN resources, facilitating VPN resource identification and management. You can add tags for a VPN resource when you create the VPN resource. Alternatively, you add tags for an existing VPN resource on the resource details page. A maximum of 20 tags can be added for each VPN resource.

A tag consists of a key and a value. Table 1 describes the requirements on the keys and values of VPN tags.

**Table 1** Requirements on the keys and values of VPN tags
Parameter	Requirement	Example Value
Key	Cannot be left blank. Must be unique for the same VPN. Can contain a maximum of 128 characters. Can contain only the following types of characters: Digits Spaces Letters Special characters, including _ . : - = + @ Cannot start or end with a space or start with _sys_.	vpn_key1
Value	Can contain a maximum of 255 characters. Can contain only the following types of characters: Digits Spaces Letters Special characters, including . : - = + @ / _	vpn-01