DIGITAL GIGAswitch/Router User Reference Manual
79
Configuring VRRP
Setting Pre-empt Mode
When a Master router goes down, the Backup with the highest priority takes over the IP
addresses associated with the Master. By default, when the original Master comes back up
again, it takes over from the Backup router that assumed its role as Master. When a VRRP
router does this, it is said to be in
pre-empt mode
. Pre-empt mode is enabled by default on
the GSR. You can prevent a VRRP router from taking over from a lower-priority Master by
disabling pre-empt mode. To do this, enter the following command in Configure mode:
Note:
If the IP address owner is available, then it will always take over as the Master,
regardless of whether pre-empt mode is on or off.
Setting an Authentication Key
By default, no authentication of VRRP packets is performed on the GSR. You can specify a
clear-text password to be used to authenticate VRRP exchanges. To enable authentication,
enter the following command in Configure mode:
where
<key>
is a clear-text password.
Note:
The GSR does not currently support the IP Authentication Header method of
authentication.
Disable pre-empt mode for a
virtual router.
ip-redundancy set vrrp
<vrid>
interface
<interface>
preempt-mode disabled
Set an authentication key for a
virtual router.
ip-redundancy set vrrp
<vrid>
interface
<interface>
auth-type text auth-key
<key>