I was informed that there is a loop in our interface, and it is not up.
When I do a sh interface, I found it is up but there is a word (looped) as
shown below. What is the meaning??? What happen ?? When I show cdp
neighbor, I see the cdp neighbor of the interface is the router itself??
Why???
sin03>sh int s1/0
Serial1/0 is up, line protocol is up (looped)
sin03>sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
sin03 Ser 1/0 136 R c3660 Ser 1/0
TYO02 Ser 1/1 154 R 1750 Ser 0
HKG01 Ser 1/2 167 R 1750 Ser 0
SYD02 Ser 2/1 157 R 1750 Ser 0
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