how to see the boot process for network devices, such as firewall, SW, router and load balance

I have a KVM for servers, but I want to know how to see the boot process for network devices, such as firewall, SW, router and load balance
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nociSoftware EngineerCommented:
Well that depends, some have a serial port (or Serial over USB)  than can be watched. RS232 of on following ones.
Otherwise there are similar contants on the motherboard where a serial interface can be connected or some programming interface.

The latter require specific tooling to access.

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EnjoyNetAuthor Commented:
What kind of KVM device can do this function?  I have Avocent 16-Port Rackmount KVM Over IP Switch.  It looks like it can't do it.  Thanks
nociSoftware EngineerCommented:
Not a KVM switch (KVM = Keyboard, Video, Mouse...) so that won't work as most appliances only something like RS-232 or derivative.
In the case of RS-232,  RS-422, RS-485 one can use.

or the like.... but check the appliance FIRST; not unimportant: TEST BEFORE BUY: that the device does not cause a LONG_BREAK signal in the direction of the appliance.
(might be caused by power instability during powercycle of the serial port server device the long break MAY CAUSE re boot of the appliciance
so you will need a verification).

Then you also need some software that and monitors and logs all ports...   connserver
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