R3204P16-HP Load Balancing Module High Availability Configuration Guide-6PW101

Item Descri

tion

Virtual IP

Configure the virtual IP address of the VRRP group.

If an interface connects to multiple subnets, you can configure multiple virtual IP

addresses for the VRRP group to implement router backup on different subnets.

TIP:

• The virtual IP address cannot be 0.0.0.0, 255.255.255.255, a loopback

address, any other invalid IP address (like 0.0.0.1), or an address that does not

belong to class A, B or C.

• The virtual IP address can be either an unused IP address on the segment where

the VRRP group resides or the IP address of an interface on a router in the VRRP

group. In the latter case, the router is called the IP address owner. Removal of the

VRRP group on the IP address owner will cause IP address collision. In such a

case, it is recommended to modify the IP address of the interface on the IP

address owner to resolve the collision.

• The VRRP group can operate normally only when the configured virtual IP

address and the interface IP address belong to the same segment and are valid

host addresses. If the configured virtual IP address and the interface IP address

do not belong to the same network segment, or the configured IP address is the

network address or network broadcast address of the network segment that the

interface IP address belongs to, the state of the VRRP group is always initialize

though you can perform the configuration successfully, that is, VRRP does not

take effect in this case.

Priority

Set the priority of the routers in a VRRP group. The greater the value, the higher the

priority.

TIP:

• VRRP determines the role (master or backup) of each router in the VRRP group by

priority. A router with a higher priority has more opportunity to become the

master.

• VRRP priority is in the range of 0 to 255. Priority 0 is reserved for special uses

and priority 255 for the IP address owner.

• When a router acts as the IP address owner, its priority is always 255. That is, the

IP address owner in a VRRP group acts as the master as long as it works properly.

Preempt Mode

Set the working mode of the VRRP group.

• Preemptive—preemptive mode. After setting the preempt mode to Preemptive,

you need to configure the preemption delay time.

• Non-preemptive—non-preemptive mode.

TIP:

An IP address owner always works in the preemptive mode.

Delay