Integrated IS-IS Configuration Commands 599■ key: Specifies the authentication key on an interface. It is a character string notexceeding 16 characters. This value must equal the authentication key of thevirtually linked neighbor. And the key will be displayed in a cipher text form in alength of 24 characters when display current-configuration command isexecuted. Inputting the key in a cipher text form with 24 characters long is alsosupported.DescriptionUsing the vlink-peer command, you can create and configure a virtual link. Usingthe undo vlink-peer command, you can cancel an existing virtual link.According to RFC2328, the OSPF area should be connected with the backbonenetwork. You can use vlink-peer command to keep the connectivity. Virtual linksomewhat can be regarded as a common ospf enabled interface so that you caneasily understand how to configure the parameters such as hello, retransmit, andtrans-delay on it.One thing should be mentioned. When configuring virtual link authentication,authentication-mode command is used to set the authentication mode as MD5cipher text or simple text on the backbone network.For the related command, see authentication-mode, and display ospf.ExampleCreate a virtual link to 10.110.0.3 and use the MD5 cipher text authenticationmode.[3Com-ospf] area 10.0.0.0[3Com-ospf-area-10.0.0.0] vlink-peer 10.110.0.3 md5 3 345Integrated IS-ISConfigurationCommandsarea-authentication-modeSyntaxarea-authentication-mode { simple | md5 } password [ ip | osi ]undo area-authentication-mode { simple | md5 } [ ip | osi ]ViewIS-IS viewParameter■ simple: Transmits the password in simple text.■ md5: Transmits the password encrypted with MD5.■ password: Specifies the password to be configured, in the range of 1~24 bits.■ ip: Specifies the IP authentication password.■ osi: Specifies the OSI authentication password.■ The configuration of ip or osi authentication password is independent of thereal network environment.
