On Mon, 12 Jun 2000, Emmanuel Solomon wrote:
> I am still not clear on that. What are the pros/cons on using one against the
> other? And isn't that happening over the console port?
With in-band management if the means to manage the box is over the same
channel as the item that you are managing, then you have a problem if that
link goes down.
Say you have a router in a remote area, and the only access you have to
it is telnet over the serial link. Suddenly the router becomes unreachable.
Is the power down?
Is there carrier on the line?
Has someone changed an IP address?
Is it a memory failure?
Is the PVC misconfigured or deleted in the frame cloud?
Is it a DoS attack and the CPU is at 100%?
You have no way of knowing. That's in-band management. The management is
done over the same link (bandwidth) as the item being managed.
Now, what if you had a modem connected to that router's console port
and a phone line. You dial up that phone line and connect to the router's
console port. Now you can see the interface status, error logs, CPU, etc.
Even if you can't get in, you have some hints.
If the modem doesn't answer it's likely a power problem.
If the modem answers and connects but nothing responds, the power is
OK but the router is wedged or failed hard.
That's out-of-band management. Your ability to manage the router is
over a different path than the one you're managing.
It can mean the difference between sitting on the patio sipping a cool one
waiting for the phone company to call you back and driving a hundred miles
with a laptop.
Network administration is the only job I know where you can get paid, and
paid very well, for spending most of your time cussing out various telephone
companies.
--
Jay Hennigan - Network Administration - [EMAIL PROTECTED]
NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
WestNet: Connecting you to the planet. 805 884-6323
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