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

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 Routing configuration. Configure VRRP or a dynamic routing protocol on the devices and the
uplink/downlink devices to make sure that the traffic can automatically switch to the other device
when a device fails.
 Service backup configuration, which can implement real-time service backup between the two
devices.
This configuration guide only introduces the service backup configuration.
Complete the following tasks to configure stateful failover:
Task
Remarks
Enabling stateful failover
Required
Configuring the failover interface
Required
Service module related configurations
Optional
A device providing NAT, ALG, blacklist, or DHCP server
services automatically backs up related information to the
backup device after the configurations take effect.
For a device providing portal services, you need to
perform further configurations on the device before it can
automatically back up portal service information to the
backup device. For more information, see Security
Configuration Guide.
Enabling stateful failover
When you enable stateful failover with the dhbk enable backup-type { dissymmetric-path |
symmetric-path } command, one of the following happens:
 If you specify the dissymmetric-path keyword, the two devices operate in active/active mode.
Sessions enter and leave the internal network through different devices to achieve load sharing.
 If you specify the symmetric-path keyword, the two devices operate in active/standby mode.
Sessions enter and leave the internal network through one device.
Select a keyword based on the network environment and resources, and specify the same keyword
for both devices.
To enable stateful failover:
Step
Command
Remarks
1. Enter system view.
system-view
N/A
2. Enable stateful failover in a
specified mode.
dhbk enable backup-type
{ dissymmetric-path |
symmetric-path }
Disabled by default.