R0106-HP MSR Router Series High Availability Command Reference(V7)

1
Interface backup commands
backup interface
Use backup interface to specify a backup interface for an interface.
Use undo backup interface to remove a backup interface.
Syntax
backup interface interface-type interface-number [ priority ]
undo backup interface interface-type interface-number
Default
An interface does not have backup interfaces.
Views
Interface view
Predefined user roles
network-admin
Parameters
interface-type interface-number: Specifies a backup interface by its type and number.
priority: Assigns a priority to the backup interface. The value range is 0 to 255, and the default is 0. The
greater the value, the higher the priority.
Usage guidelines
Use this command on the primary interface to specify its backup interfaces. If you also configure the
traffic thresholds, the primary and backup interfaces operate in load balancing mode. If you do not
configure the traffic thresholds, the primary and backup interfaces operate in strict active/standby mode.
Backup interface priority is used for interface backup to make interface activation or deactivation
decisions when the primary interface fails or is overloaded. Backup interfaces are activated in
descending order of priority, with the highest-priority interface deactivated first. In contrast, they are
deactivated in ascending order of priority, with the lowest-priority interface deactivated first.
Once a backup interface is activated to forward traffic, only the primary interface can preempt it. A
higher-priority backup interface cannot preempt a lower-priority backup interface that has taken over the
primary interface.
Use Table 1 w
hen you configure primary and backup interfaces.
Table 1 Restrictions on the primary and backup interfaces
Item Restrictions
Maximum number of primary
interfaces/device
10.
Backup interfaces/primary interface 3.