3Com 8807 Command Reference Manual page 461

OSPF Configuration Commands 459
key: Specifies the MD5 authentication key. If it is input in a plain text form, MD5
key is a character string in the range 1 to 16 characters. It will be displayed in a
cipher text form in a length of 24 characters when the display
current-configuration command is executed. Inputting the MD5 key in a cipher
text form with 24 characters is also supported.
Description
Use the vlink-peer command to create and configure a virtual link.
Use the undo vlink-peer command to cancel an existing virtual link.
According to RFC2328, the OSPF area should be connected with the backbone
network. You can use the vlink-peer command to keep the connectivity. Virtual
link can be regarded as a common OSPF-enabled interface so that you can easily
understand why to configure the parameters such as Hello, retransmit, and
trans-delay on it.
One thing should be mentioned. When configuring virtual link authentication, the
authentication-mode command is used to set the authentication mode as MD5
cipher text or simple text on the backbone network.
Related command: authentication-mode, display ospf.
Example
# Create a virtual link to 10.110.0.3 and use the MD5 cipher authentication mode.
[3Com-ospf-1] area 10.0.0.0
[3Com-ospf-1-area-10.0.0.0] vlink-peer 10.110.0.3 md5 3 345
# Specify this virtual link to run Fast Hello function and send five Hello packets.
[3Com-ospf-1-area-10.0.0.0] vlink-peer 10.110.0.3 dead minimal
multi-hello 5