R3303-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
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.
Configuring the failover interface
To implement stateful failover between two devices, you need to configure the interfaces between them
as failover interfaces. These interfaces can only forward state negotiation messages and backup data
instead of service data and cannot be displayed using the display interface command.
To configure a failover interface: