For us the provider of the line is testing with a hard loop on their edge of the network. Another solution was that we had a soft loop on our end (c2821) under controller e1 x/x/x with "loopback local line" towards the remote destination, and on the remote destination "show int serial x/x/x:x" showed looped.
What do you want to test actually? If the controllers are UP on both end then you have connectivity there.
The idea is like this. You give a soft loop on one end and and when you do "show interface serial x" on the other end you will see in the brackets the word looped.
So, as an example, under controller T1 configuration in your c2821 you issue "loopback local line" and in the opposite end when you issue "show interface serial x" look after the word looped.Of course than you can do the test viceversa.
I don't know the topology but be aware that when you issue a soft loop on the line, you break the connection. So, if you reach the remote end over this T1 lines, that you will lose your connection.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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