Introduction to
Backup Center
Settings
Configuring Interface
Backup
Configuring
Main/backup Mode
Figure 580 Diagram for load sharing mode
Router A
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
other.
n
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.
Task
"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
same time.
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
A%
B%
S2/0
C%
+
+
A%
B%
C% = 100%
Introduction to Backup Center Settings
Router B
LAN
Remarks
Optional
Optional
1963
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