Configuring Ethernet Ports Link Monitoring
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 1-21
Monitoring Window
The Link Monitoring window is a per-port configurable timer that is started whenever link-monitoring is
enabled on a port. During this time frame interface receive errors and interface flaps are counted. If either
of the values exceeds the configured thresholds the interface is shut down.
• The timer value can be modified even when the Link Monitoring timer is running and the new value of
timer will take effect after the current running timer expires.
• The threshold values for link errors and link flaps can also be modified when link-monitoring timer is
running; if the new threshold value is less than the current link-flap or link-error counter value, then the
interface will be shutdown immediately.
The interfaces link-monitoring time-window command is used to configure the monitoring window
timer. For example:
-> interfaces 1/1 link-monitoring time-window 500
In this example, link monitoring will monitor port 1/1 for 500 seconds.
Starting a Link Monitoring Session
The Link Monitoring window timer is started when the feature is enabled on an interface using the
interfaces link-monitoring admin-status command. For example:
-> interfaces 1/1 link-monitoring admin-status enable
All the statistics (link errors and link flaps) for a port are reset to zero when Link Monitoring is enabled on
that port.
Stopping a Link Monitoring Session
The Link Monitoring window timer is stopped when one of the following occurs:
• The interfaces link-monitoring admin-status command is used to disable the feature on the port. For
example:
-> interfaces 1/1 link-monitoring admin-status enable
• The port is shutdown by any feature, such as Link Monitoring, UDLD, or Link Fault Propagation.
Configuring the Wait-to-Restore Timer
The wait-to-restore (WTR) timer is used to implement a delay before an interface is made operational for
other features. Only after the timer has expired will the interface become active allowing network
protocols to converge more gracefully. The timer value is configured on a per-port basis and is started
whenever one of the following link-up events occurs:
• An interface is administratively downed followed by administratively up.
• The interfaces split-mode command is used.
• An interface recovers from a violation due to the automatic recovery timer mechanism.
• An interface is made operationally up when the cable is plugged in.
Consider the following when configuring the wait-to-restore timer:
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