Configuring Interface Backup; Overview; Compatible Interfaces; Backup Modes - HP MSR Series Configuration Manual

Configuring interface backup

Overview

Interface backup enables you to configure multiple backup interfaces for a Layer 3 interface to increase
link availability. When the primary interface fails or is overloaded, its backup interfaces can take over or
participate in traffic forwarding.

Compatible interfaces

The interface backup feature is configurable for the interfaces in
Table 1 Interfaces that support interface backup
Category
Ethernet
WAN
Others

Backup modes

The primary interface and its backup interfaces can operate in strict active/standby mode or load
sharing mode.
Strict active/standby mode—Only one interface transmits traffic. All the other interfaces are in
•
STANDBY state.
• Load sharing mode—Backup interfaces participate in traffic forwarding when the amount of traffic
on the primary interface reaches the upper threshold. They are activated and deactivated
depending on the amount of traffic.
Interfaces
Layer 3 Ethernet interfaces/subinterfaces
Layer 3 VE interfaces
AM interfaces
ATM interfaces
ISDN BRI interfaces
POS interfaces
Serial interfaces (asynchronous, synchronous)
AUX ports
Dialer interfaces
MP-group interfaces
Tunnel interfaces
Table
1
1.
Remarks
N/A
The AM interfaces can only work as
backup interfaces. All the other
interfaces can work as both primary
and backup interfaces.
An ISDN BRI interface can work as
the primary interface only when it is
configured to provide leased line
services.
An asynchronous serial interface
cannot work as the primary
interface if DDR is configured on it.
A dialer interface can be used as
the primary interface only when it is
a PPPoE client in permanent session
mode.