HP VPN Firewall Appliances High Availability Configuration Guide

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Configuring interface backup
The term "router" in this document refers to both routers and routing-capable firewalls and firewall
modules.
Interface backup can be configured only at the CLI.
Feature and hardware compatibility
Hardware Interface backu
p
com
p
atibilit
y
F1000-A-EI/F1000-S-EI Yes
F1000-E Yes
F5000 Yes
F5000-S/F5000-C Yes
VPN firewall modules Yes
20-Gbps VPN firewall modules No
Overview
Interface backup increases network reliability. The active interface transmits services, and the standby
interfaces are in the backup state. When the active interface fails or the link fails, or when the traffic on
the active interface exceeds the configured threshold, a standby interface is activated to transmit
services.
As shown in Figure 79, inter
faces S
erial 2/0, Serial 2/1, and Serial 2/2 on Router A back up each other.
Serial 2/0 transmits data, and Serial 2/1 and Serial 2/2 are standby interfaces that have different
priorities.
Figure 79 Diagram for interface backup
When interface Serial 2/0 or its link to Router B fails, or when the traffic on Serial 2/0 exceeds the
configured threshold, the standby interface with the highest priority is activated, ensuring uninterrupted
data transmission.