generally, loopbacks are excellent for continuity testing and also to
determine if equipment (which includes cables, etc) is faulty - if one sends
test patterns and takes BERS to a router loop, it could mean the router
port, the cable or telco demarc is not good. as indicated below, one can
remove the loop with code or one could just power cycle the router.
mjs
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, July 27, 2000 8:38 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: Loopbacking the Router? (why???)
I was just wondering why you would waste a physical int. for a loopback? You
can create logical interfaces with the "int Loopback0" and so on. So why
would you take up a serial int unless you were using subinterfaces? I'm not
trying to be smart. I really want to know what or why this would be used
instead of logical int's. Thanks group.
Mark Z. ~ CCNA (CCDA on Monday the 31st) :)
In a message dated 27.07.00 18:29:46 Central Daylight Time, [EMAIL PROTECTED]
writes:
<< just to let you know that you can set a loopback on a Cisco router from
the
router ?
You must be in the priv mode not user mode to put the router in loopback.
Router#
Router#conf ter ( hit enter )
Router(config)#int s0 ( hit enter )
Router(config-if)#LOOPBACK (hit enter )
Router(config-if)#end (hit enter )
Router#sho int s0 ( you will now see the serial interface in loopback)
To remove the loopback from the serial interface just reload the router
or
do this:
Router#
Router#conf ter ( hit enter )
Router(config)#int s0 ( hit enter )
Router(config-if)#NO LOOPBACK (hit enter )
Router(config-if)#end (hit enter )
Router#sho int s0 ( you will now see the serial interface out of the
loopback)
Brian
Email Address [EMAIL PROTECTED] >>
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