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Everyone:
I thought I'd pick your brains for a few
minutes with this one.
I have a 4000M running 12.0(3)T Enterprise, 2 2500
series, and my trusty AGS+. Last night, I was playing with the
configurations doing some BGP scenarios for the BSCN test I'm taking
tomorrow.
Last night, I took the 2 port synchronous serial
module out (the one with the 50 pin connectors) because I didn't have any cables
for it, and I DID have cables for the 4 port serial with the 60 pin
connectors. I have my routers hooked up with back to back cables in
various ways, and I was going to have the 4000M provide clocking.
After hooking everything up, providing the clock
rate command, etc, a show interfaces command showed that both serial 0 and
serial one were reading up/up (looped). The running-configuration showed
the loopback command under both serial interfaces (I certainly didn't put it
there). When I attempted to remove from the (config-int)# mode, the router
accepted the command, but a show running-config still had the loopback
command.
I then reversed the back-to-back cable on
serial 1 so that the 2524 was providing clocking. The loopback command
dropped up, but I still couldn't get the serial interface to come
up.
Finally, I just hooked one cable up to the
4000M (the DTE) end, and used my 2524 to provide the two serial ports for the
lab I'm doing. I had copied the configuration to post, but ::cough::
forgot to paste it into a text file before restarting the computer.
I'm going to do some more thorough testing
later, but as I still have OSPF to review and policy routing tonight, I'm not
going to mess with it until tomorrow.
I researched this through the Documentation
CD I have, under the 4000, the network processor modules, IOS 12.0, IOS 12.0
release notes, and IOS 11.2, and four or five other places that looked
promising.
Curiously, after I reversed the first cable
and removed the other, the Cisco 2524 was then showing that serial 1 was
looped. It accepted the no loopback command, and everything was good to go
afterwards.
Am I making this far harder than it
is?
Joel Studtmann
MCSE, MCP+I
A+, Network+ CCNA/CCDA |
