Take the 100% Cisco job. You'll see things in your day to day work that
you'd never think to create in a lab and you'll see things that you *can't*
create in a home lab. Let me give you an example:
Our area code is switching to 10 digit dialing. We have numerous customers
connecting to our backbone via ISDN. I sent one of my junior guys out to
change the dialer entry on a 700 series router to 10 digits. He changes
the entry, reboots the router, and the circuit won't come back up. He
calls me and, he being rather inexperienced, I suspected he changed more
than the dialer entry. Since 700 series routers are a pain to deal with, I
had him swap it for an 800 series. I build a config and have him load it
into the 800 series. The circuit *still* won't come up. We call the both
Cisco TAC and the telco. The local loop tests clean. On a hunch, I have
them test the local loop at our side of the connection. The local loop
tests clean. Cause codes from the debug are inconclusive, but Cisco TAC
verifies that there's nothing wrong with our equipment or configs. I get
more senior telco engineer on the line and we watch the end-to-end
process. He suspects that errors are being introduced on the D channel
somewhere between our backbone ISDN router and the telco. I replace the
ISDN card in our router and the problem still exists.
Senior engineer suggests replacing linecard at the CO; his boss, also on
the teleconference, overrules and says that they'll send a guy out to our
site the next morning (because, afterall, they're the telco and it MUST be
our problem). 24 hours later, the telco guy finally shows up to test the
line. Line tests clean. I show the guy the router debugs and explain how
it's not our equipment with the problem and how I don't care that the line
tests clean....I want the CO linecard replaced. He says that they can't do
that if everything is clean. I tell him that my customer is down, it's the
only remaining option since everything else has been tested, and that it
won't hurt to try it. He gets approval to have the linecard changed. When
the linecard is replaced, the previously broken ISDN circuit connects
immediately. This is the type of debug and troubleshooting process that
you'll never be able to create in a home lab.
Craig
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