Something I feel that gets glazed over in the real world that I took for granted when just labbing is the debug command. When you have one device with a million plus connections running through it running a debug command isn't always feasible.

In most cases you just can't do it. In the lab it's as easy as debug <this> and debug <that> and also debug <someofthis>. Sure you can get granular but in most cases that I've been in even specific debug commands targeting one area can cause too much load on a device.

If you have to and there's no way around it though make sure to no console logging. It might just give you those 2 extra seconds to turn debugging off.

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- Pete

This got me thinking....if you have nothing connected to the console port, then is the switch/router logging to console in the first place? And if it is not, then is 'no logging console' really doing anything?

Over an SSH/telnet connection, the switch/router is logging to the vty session (assuming you have 'terminal monitor' on). Even with 'no logging console,' it still logs to the vty session:



This also assumes you have 'logging monitor' configured. In my case, I had it configured to log up to informational messages. It may also be appropriate to do 'no logging monitor' as well and have the switch/router just log to the buffer (assuming you have 'logging buffered' configured). At that point it'll only be using CPU cycles to log to one source.

The thing is thought unless you've got bulk memory/space you aren't going to know what your buffer should be and could miss information. Hence the point of displaying it on screen.

But when a device is under load some of these debug commands just rape stuff.

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- Pete

If you simply must debug, debug through an ACL and set an interface (or subinterface)

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If a tree falls in the forest and nobody is there to hear it. does it make a sound ?

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"If you're good at anticipating the human mind. It leaves nothing to chance."
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