This command configures the authentication type and key for the OSPF virtual interface identified by areaid and neighbor. The neighbor parameter is the Router ID of the neighbor. The value for type is either none, simple, or encrypt. The key is composed of standard displayable, noncontrol keystrokes from a Standard 101/102-key keyboard. The authentication key must be 8 bytes or less if the authentication type is simple. If the type is encrypt, the key may be up to 16 bytes.
Unauthenticated interfaces do not need an authentication key. If the type is encrypt, a key id in the range of 0 and 255 must be specified. The default value for authentication type is none. Neither the default password key nor the default key id are configured.
| Default | None |
| Format | area areaid virtual-link neighbor authentication {none | {simple key} | {encrypt key keyid}} |
| Mode | Router OSPF Config |
