You enter the show ip interface brief command and notice that the status of an interface is as follows: Serial 0/0/0 is up, line protocol down (looped). How would you troubleshoot this issue?
What will be an ideal response?
If a loopback interface is configured, use the no loopback interface command. If there is no
loopback interface configured, check to see whether the CSU/DSU is in manual loopback
mode. If this is the case, disable manual loopback.
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