Draytek Vigor3900 User Manual page 312

Available parameters are listed as follows:
Item
Profile
HA LAN Profile
Virtual IP for
Gateway
VHID
Apply
Cancel
4. Enter all of the settings and click Apply.
Description
Type a name for such profile.
Choose one of the LAN profiles that such function will be
applied to.
Assign an IP address as a virtual IP.
It means Virtual Host ID. Type a number as VHID for such
function. VHID is used for Backup router to identify which
Master will be backed up.
Click it to save the configuration.
Click it to discard the settings configured in this page.
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Vigor3900 Series User's Guide