cdp neighbor review...

the farther away from home you are, the closer you become...

als2#sh cdp neigh                                                                               
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge                         
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone                       
                                                                                                
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID                     
dls2                       Fas 0/7            139         R S I     WS-C3550-4Fas 0/7                     
dls2                       Fas 0/8            139         R S I     WS-C3550-4Fas 0/8                     
dls1                     Fas 0/10           135         R S I     WS-C3550-2Fas 0/10                    
dls1                       Fas 0/9            135         R S I     WS-C3550-2Fas 0/9                     
als1                      Fas 0/12           153          S I      WS-C2950-2Fas 0/12                    
als1                      Fas 0/11           153          S I      WS-C2950-2Fas 0/11                    
als2#

                                          won't you be my cdp neighbor...

the device id is the remote device name

the local interface is the local switch's interface connected to the remote device

holdtime is the number of seconds the local device will retain the last advertisement received from the remote host

capability code is what type of device the remote host is

platform is its hardware platform

port id is the directly connected remote interface