R0106-HP MSR Router Series High Availability Configuration Guide(V7)
5
Ste
p
Command
Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface interface-type
interface-number
This interface must be the primary interface.
3. Specify a backup
interface.
backup interface
interface-type
interface-number [ priority ]
By default, an interface does not have any
backup interfaces.
Repeat this command to specify up to three
backup interfaces for the interface.
4. Set the switchover delay
timers.
backup timer delay up-delay
down-delay
By default, the up and down delay timers are
both 5 seconds.
Using interface backup with the Track module
To use interface backup with the Track module to provide strict active/standby backup for a primary
interface:
• Configure a track entry to monitor state information of the primary interface. For example, monitor
its link state.
• Associate the track entry with a backup interface.
Interface backup changes the state of the backup interface in response to the track entry state, as shown
in Table 2.
Table 2 Action on the backup interface in response to the track entry state ch
ange
Track entr
y
state
State of the monitored
p
rimar
y
link
Action on the backu
p
interface
Positive The primary link is operating correctly.
Places the backup interface in
STANDBY state.
Negative The primary link has failed.
Activates the backup interface to take
over.
NotReady
The primary link is not monitored.
This situation occurs when the track module
or the monitoring module is not ready, for
example, because the Track module is
restarting or the monitoring settings are
incomplete. In this situation, interface backup
cannot obtain information about the primary
link from the track module.
• If the track entry state stays in
NotReady state after it is created,
interface backup does not change
the state of the backup interface.
• If the track entry state changes to
NotReady from Positive or
Negative, the backup interface
changes back to the forwarding
state before it was used for
interface backup.
For more information about configuring a track entry, see "Configuring Track."
When you associate a backup interface with a track entry, follow these guidelines:
• You can associate an interface with only one track entry.
• You can create the associated track entry before or after the association. The association takes
effect after the track entry is created.
• To maintain performance, limit the number of associations to 64.
To associate Track with an interface: