1.3.a [i] debug, conditional debug
When the conditionally triggered debugging feature is enabled, the router generates debugging messages matching a given condition. For example , you may only want to see debugging messages for one interface or sub-interface. You can also turn on debugging for all interfaces that meet specified conditions.
Normally, the router will generate debugging messages for every interface, resulting in a large number of message that consume system resources and can make it difficult to find the specific information you need. By limiting the number of debugging messages, you can receive messages related to only the ports you want to troubleshoot.
You can use conditional debug as follows: router# debug condition interface < interface >
You can verify conditional debug configuration using show debug or show debug condition.
Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 1347-1353). Kindle Edition.
rtr1#debug condition ?
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