(BP-range 1-255) ordinarily determines which VIP is the master VIP, but
effective priority (EP) can also affect the determination.
For example, if a
VIP on NS1 has a priority of 101 and same VIP on NS2 has a priority of 99, the
VIP on NS1 is active. However, if two vservers are using the VIP on NS1 and one
of them goes DOWN, health tracking can reduce the EP of VIP on NS1. VRRP then
makes the VIP on NS2 the active VIP.
Following are the
health tracking options for modifying EP:
- NONE. No tracking. EP =
- ALL. If all virtual
servers are UP, then EP = BP. Otherwise, EP = 0.
- ONE. If at least one
virtual server is UP, then EP = BP. Otherwise, EP = 0.
- PROGRESSIVE. If ALL
virtual servers are UP, then EP = BP. If ALL virtual servers are DOWN then EP =
0. Otherwise EP = BP (1 - K/N), where N is the total number of virtual servers
associated with the VIP and k is the number of virtual servers that are down.
Note: If you specify
a value other than NONE, preemption should be enabled, so that the backup VIP
with the highest priority becomes active if the priority of the master VIP is