During a network migration window, an engineer issues the set protocols isis overload timeout 1200 command.
In this scenario, which effect does this have on the IS-IS operations of the router?
A.
After the first IS-IS adjacency forms, the overload bit is set for 1200 seconds.
B.
When the IS-IS protocol starts, the overload bit is set after the timer of 1200 seconds expires.
C.
When the IS-IS protocol starts, the overload bit is set for 1200 seconds.
D.
After the first IS-IS adjacency forms, the overload bit is set after the timer of 1200 seconds expires.
Explanation:
With a timeout, overload mode is set if the time elapsed since the IS-IS instance started is less than the
specified timeout.
To specify the number of seconds at which overload is reset, include the timeout option when specifying the
overload statement:
overload timeout seconds;
The time can range from 60 through 1800 seconds.
http://www.juniper.net/documentation/en_US/junos12.1×47/topics/usage-guidelines/routingconfiguring-is-is-to-make-routers-appear-overloaded.html
C correct
https://kb.juniper.net/InfoCenter/index?page=content&id=KB14108
In JUNOS, the overload timer starts running after the initial RPD startup and after you have configured an ISIS instance with the overload bit option. It will only take RPD startup time and not the instance activation time into account. When specifying the overload timeout period in JUNOS the ISIS overload bit is N period of times after the RPD startup time.
https://forums.juniper.net/t5/Routing/Protocol-overload-on-startup/td-p/154502
You configure or disable overload mode in IS-IS with or without a timeout. Without a timeout, overload mode is set until it is explicitly deleted from the configuration. With a timeout, overload mode is set if the time elapsed since the IS-IS instance started is less than the specified timeout.
https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/overload-edit-protocols-isis.html
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