Configuring The Wait-To-Shutdown Timer - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring Ethernet Ports
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If the interface goes down again while the WTR timer is still running, the WTR timer is stopped.
Otherwise, the interface is recovered after the time expires.
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The WTR timer functionality has no impact on link-error or link-flap detection; these features are
configurable even when the WTR timer is disabled.
•
The timer value can be modified when the WTR timer is running; however, the new timer value does
not take effect until after the current running timer expires.
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The WTR timer is reset on every link up event that is detected.
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The WTR timer is stopped on detection of every link down event.
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When the WTR timer is running, the interface is physically up but the link status is down.
The interfaces wait-to-restore
example, the following commands set the WTR timer value to 300 seconds:
-> interfaces 1/1 wait-to-restore 300
To disable the WTR timer mechanism, set the timer value to zero. For example:
-> interfaces 1/1 wait-to-restore 0
By default, the WTR time is disabled.

Configuring the Wait-to-Shutdown Timer

The wait-to-shutdown (WTS) timer is used to implement a delay before an interface is made non-
operational for other applications such as data, control and management. Only after the timer has expired
will the interface become disabled 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:
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An interface is administratively brought down.
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An interface is shutdown from a violation.
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An interface is made operationally down when the cable is unplugged in.
When the interface goes down, the WTS timer will be started. If the interface comes back up while the
WTS timer is running, then WTS timer will be stopped and no link down event will be sent. Otherwise,
after the WTS timer expiries a link-down event will be sent to all the relevant applications.
Consider the following when configuring the wait-to-shutdown timer:
•
If the interface comes back up while the WTS timer is still running, the WTS timer is stopped and no
link down event is sent to other switch applications.
•
The WTR timer functionality has no impact on link-error or link-flap detection; these features are
configurable even when the WTS timer is disabled.
•
The timer value can be modified when the WTS timer is running; however, the new timer value does
not take effect until after the current running timer expires.
•
When the wait-to-shutdown timer is running there would be packet loss on that interface. This is
because the port is physical down and only the link-down event is not being communicated to the
switch applications which will continue to send packets to the interface.
OmniSwitch AOS Release 8 Network Configuration Guide
command is used to configure the WTR timer value, in multiples of 5. For
December 2017
Link Monitoring
page 1-22