H3C Technologies H3C MSR 50 - Manual (Page 24)

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• The standby interface configured later is shut down first and exits load balancing with the active
interface.
IMPORTANT:
When you use the load balancing function, use the undo ip fast-forwarding command to disable fast
forwarding on both the active interface and the standby interfaces. For more information about the undo
ip fast-forwarding command, see Layer 3—IP Services Command Reference.
To configure load balancing:
Step Command Remarks
20. Enter system view. system-view N/A
21. Enter active interface view.
interface interface-type
interface-number
N/A
22. Configure the available
bandwidth used for setting the
thresholds.
standby bandwidth size
Optional.
0 kbps by default.
23. Configure load balancing
thresholds.
standby threshold
enable-threshold disable-threshold No load balancing thresholds are
configured by default.
24. Configure the interval for
detecting traffic size on the
active interface. standby timer flow-check interval
Optional.
30 seconds by default.
Configuring the delay timer for the backup function
to take effect on system startup
Generally, H3C recommends that you use the default settings for the devices supporting this feature. If
you set a too short timer, the standby interfaces will be activated and deactivated in a short time on
system startup; if you set a too long timer, when the active interface fails, the standby interfaces take too
long time to take effect on system startup.
This feature takes effect on all the standby interfaces working in active/standby mode, but does not take
effect on the standby interfaces working in load balancing mode.
The device restores its configuration when starting up. If the device is configured with the backup function,
during the configuration restoration process, the system enables the delay timer for the backup function
to take effect on system startup, because the status of all the interfaces is down. If the delay timer times
out, but the active interface is not up (because the cables are not well connected, or parameter
negotiation is being performed), the system will activate a standby interface to start interface backup.
When the active interface is up, the system will disable the standby interface, and set its status to down.
To avoid activation and deactivation (up and down) of the standby interfaces in a short time on system
startup, you can modify the delay timer for the backup function to take effect on system startup, so that the
standby interfaces will be activated only when the delay timer times out and the active interface is not up.
To set the delay timer for the backup function to take effect on system startup:
Step Command Remarks
25. Enter system view. system-view N/A