R4 has Cat1 on fa 0/0 not fa 0/1
R4#sho cdp neighbors
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
Cat3560-3 Fas 0/1 149 R S I WS-C3560- Fas 0/4
Cat3550-1 Fas 0/0 172 R S I WS-C3550- Fas 0/4
R4#conf t
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