Introduction To Backup Center Settings; Configuring Interface Backup; Configuring Main/Backup Mode - 3Com MSR 50 Series Configuration Manual

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Table of Contents

Introduction to

Backup Center

Configuring Interface

Main/backup Mode

Figure 580 Diagram for load sharing mode

In load sharing mode, you can set an upper threshold called enable-threshold and

a lower threshold called disable-threshold and traffic can be shared among

multiple interfaces:

When the traffic on the main interface increases above the predefined

enable-threshold, the backup center brings up the highest-priority backup

interface, and then other backup interfaces in decreasing interface priority

order depending on traffic size. If two backup interfaces are assigned the same

priority, the one configured first is used prior to the other.

When the traffic on the main interface decreases below the predefined

disable-threshold, the backup center shuts down the lowest-priority backup

interface first and then other participant backup interfaces in increasing

interface priority order depending on traffic size. If two backup interfaces are

assigned the same priority, the one configured later is shut down prior to the

Adopting interface backup or load sharing mode depending on whether you have

configured an upper or lower threshold for the main interface traffic. As long as

this threshold is configured, the load sharing mode is adopted; otherwise, the

interface backup mode is adopted.

"Configuring Interface Backup" on page 1963

"Configuring Load Sharing" on page 1965

You can configure interface backup through main/backup mode or association

between an interface and a Track object, but you cannot configure them at the

You can configure multiple backup interfaces for one main interface. The backup

center brings up the backup interfaces depending on their priority, the one with

the highest priority being brought up the first.

To prevent frequent interface failover and fallback as a result of interface

instability, a delay mechanism can be configured. For example, after you set a

failover delay, failover does not take place immediately after the main interface

goes down. Instead, the backup interface takes over only if the main interface