New T1: Serial Up, Line Proto Up, (looped)
Posted on 2006-05-18
We've just had a new T1 configured in our new office. I've pulled a working 2610 (hot spare) from production and plugged it's CSU/DSU T1 interface into our new smart jack. Telco is confirming they can see loopback plug in the smart jack but when we plug our equipment in all we get is:
Serial0 is up, line protocol is up (looped)
In my experience this usually means there's a loop in the line somewhere the telco has to remove. However, they're saying that is not the case.
I've verified it's an HDLC link and that s0 is confirigured for HDLC encapsulation.
To remove any doubt about a misconfiguration I've: powered down the router | removed the WIC Card | powered it back up | wrote memory | powered down | installed WIC | powered up | configured IP address, encapsulation and service-module controller T1 timeslots 1-24 | shut | no shut |
Each time the interface comes up, line protocol comes up and it keeps saying "looped" we obviously have no connectivity.
I need to get this solved ASAP.
Any help would be greatly appreciated.