In the above diagram we are having 3 switches,
Switch 1 is connected to Switch 2 and Switch 3
Switch 2 is connected to Switch 3 Switch 1
Switch 3 is connected to Switch 1 and Switch 2
But show cdp neighbors command in switch 1 and Switch 2 is not showing switch 3 as neighbor.
To solve the problem
1) Check the connectivity ( whether the link connected to switch3 is up )
# show interface status
2) Ping to switch IP address ( Whether switch is powered on or not)
3) Check CDP is enabled or not on the particular interface( #show cdp )
Note: If the ping is working properly but still not getting switch 3 in show cdp neighbors command then it may be either bad cable or bad port......
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