182
4.
The configurations on Device D are similar to those on Device A (omitted).
Configuration guidelines
•
Stateful failover can be implemented only between two devices rather than among more than two
devices.
•
The same numbered interfaces must exist on the two devices. Otherwise, session backup fails. For
example, if Device A uses GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3 to forward backup
data, Device B must also use GigabitEthernet 1/0/1 and GigabitEthernet 1/0/3.
•
Do not configure other functions or parameters on a failover interface.
•
To run NAT on two failover devices, you need to configure two identical NAT address pools for
each device, but the higher-priority address pool on a device must be different from that on the other;
otherwise, a conflict may occur during backup. For example, you can configure two NAT address
pools, 100.0.0.1 through 100.0.0.5 (Pool 1), and 100.0.0.6 through 100.0.0.10 (Pool 2) on
devices A and B. Pool 1 has a lower priority on Device A, and Pool 2 has a lower priority on Device
B. For more information, see the
Security Configuration Guide
.
