R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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Figure 55 Network diagram
Configuration procedure
1. Configure Device A:
# Enable symmetric-path mode stateful failover.
<Sysname> system-view
[Sysname] dhbk enable backup-type symmetric-path
# Specify GigabitEthernet 0/0/2 as a failover interface.
[Sysname] dhbk interface gigabitethernet 0/0/2
Warning: This configuration will result in loss of port configuration. Are you sure
to continue? [Y/N]: y
[Sysname] quit
2. Configure Router B in the same way Router A is configured. (Details not shown.)
Configuration guidelines
When you configure stateful failover, follow these guidelines:
 Stateful failover can be implemented only between two devices.
 The same numbered interfaces must exist on the two devices. Otherwise, session backup fails.
For example, if Device A uses GigabitEthernet 0/0/1 and GigabitEthernet 0/0/3 to forward
backup data, Device B must also use GigabitEthernet 0/0/1 and GigabitEthernet 0/0/3.
 Do not configure other functions or parameters on a failover interface.
 To run NAT on two failover devices, you must configure two identical NAT address pools for
each device. The higher-priority address pool on a device must be different from that on the
other. Otherwise, a conflict might 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 Security Configuration Guide.
Internet
Internal
network
Router A
Host A Host B
Router B
Failover link
GE0/0/2 GE0/0/2
GE0/0/1 GE0/0/1
GE0/0/3 GE0/0/3