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Nokia Network Voyager for IPSO 4.0 Reference Guide 195
Note
You cannot change the backup address from one interface to another interface while a
platform is in the master state. To modify a virtual IP address, first cause a failover to the
backup by reducing the priority or by pulling an interface, then delete the VRID on the
interface and re-create using the new IP address, then configure it as it was configured
before.
To add a virtual router
1. Click VRRP under Configuration > High Availability in the tree view.
2. Click VRRP Legacy Configuration.
3. In the row for the interface you want to configure, select the Monitored Circuit radio button.
4. Click Apply.
The Create Virtual Router text box appears.
Table 10 Additional VRRP Parameters Used in Full Method
Parameter Description
Preempt mode Preempt mode is enabled by default.
Check disabled to specify that this router will not fail over to a router with higher
priority. Use this setting if you want to reduce the number of transitions. For example,
if you disable preempt mode on a backup and the master fails over to it, then when
the master becomes active again, the virtual router will not fail back to it. Rather the
new master will remain the master even though it has a lower priority.
Monitored-circuit VRRP operates by triggering the failover of all mcVRRP interfaces
on a platform when one interface goes down. It triggers failover by subtracting the
priority delta from the priority for each mcVRRP interface, causing the interface to fail
over to a node with a higher priority. If you disable preempt mode, interfaces will no
longer failover in this way; they will only failover if their effective priority is 0.
Therefore, if you disable preempt mode, you must also apply the following settings to
each interface in the VRRP group. These conditions do not apply to VRRPv2.
• Enable auto-deactivation. This allows the effective priority to be set to 0. If you do
not enable auto-deactivation, the lowest effective priority allowed is 1 even if the
priority minus the delta mathematically equals 0.
• Set the priority delta to the same value as the priority for each interface on the
virtual router. This means that the priority minus the priority delta equals 0.
Monitor interface Select an interface that this interface will monitor and specify a priority delta. As you
select each interface and click Apply, it appears in the list above the Monitor interface
drop-down box.
Auto-deactivation Enable auto-deactivation if you want to allow the minimum value for effective priority
to be 0. A VRRP router with an effective priority of 0 will not become the master even
if there are no other VRRP routers with higher priority for this virtual router. If auto-
deactivation is disabled (the default), the lowest allowable value for effective priority
is 1.