CCNP - Does any one know what this means?

Author

Does any one know what this means?

beenframed

2001-09-05, 1:00 pm

Serial2/0 is up, line protocol is up (looped)

(looped) ? I just installed a new interface, plugged in the T1, added the IP info and did a show interface. This what I got.

Thanks

doctorcisco

2001-09-05, 1:33 pm

quote:
Originally posted by beenframed
Serial2/0 is up, line protocol is up (looped)

(looped) ? I just installed a new interface, plugged in the T1, added the IP info and did a show interface. This what I got.

Thanks

It means that telco has a loopback on the circuit somewhere ... probably at the CO, so they wouldn't see it in alarm until you got your equipment hooked up. You'll want to call them and have them take the loop down.

Not likely you did it, but one can also initiate a loopback toward telco on a WIC as follows:

Router(config-if)#loop line

You might want to do a no loop line on it just to make sure it's not you.

All this is assuming that your line coding, framing, and timeslots are configged per telco specs.

HTH,
loopydoctorcisco

Retired-Mod

2001-09-06, 3:36 am

I haven't seen the carriers leave a loop up intentionally to prevent alarms, but it sure seems like the best explanation. Verizon typically admin downs the circuit til you call to turn it up (I saw he was from NY so I'm guessing Verizon).

I have seen the carriers forget to take down a loop after testing but usually that's pointed in the other direction leaving you down/down. Could be that they put up a bidirectional loop while testing the circuit and forgot about it

Retired

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