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CDP Seen From Unexpected Interface

All,

 

I have a Cisco 3850 fiber switch with a single 10G link to a Cisco Nexus 7009 ("N7K"). The N7K links to the fiber switch's Te1/0/12. What I am seeing in the CDP table is switch2 and switch6 are also showing up via Te1/0/12. Switch2 is on Te1/0/7 and Switch6 is on Te1/0.2. In the CDP table below you can see the correct CDP entires as well as duplicate entires for Switch2 and Switch6 both coming off of Te1/0/12 where the N7K is.

 

My question is, what could be causing these duplicate entires for switch2 and switch6?

 

Thank you much,

 

M. Whitlow

 

3850fiberswitch#sho cdp neighbors 

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone, 

                  D - Remote, C - CVTA, M - Two-port Mac Relay 

 

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

nexus7009(JPG20130099)

                 Ten 1/0/12        178            R S I C N7K-C7009 Eth 4/19

switch1

                 Ten 1/0/4         143              S I   WS-C3850- Gig 1/1/1

switch2

                 Ten 1/0/7         153              S I   WS-C3850- Gig 1/1/1

switch2

                 Ten 1/0/12        153              S I   WS-C3850- Gig 1/1/1

switch3

                 Ten 1/0/1         153              S I   WS-C3850- Gig 1/1/3

switch4

                 Ten 1/0/6         130              S I   WS-C3750G Gig 1/0/12

switch5

                 Ten 1/0/5         156              S I   WS-C3750G Gig 1/0/12

switch6

                 Ten 1/0/2         128              S I   WS-C3850- Gig 1/1/1

switch6

                 Ten 1/0/12        128              S I   WS-C3850- Gig 1/1/1

switch7

                 Ten 1/0/11        160              S I   WS-C3560- Gig 0/1

switch8

                 Ten 1/0/3         148              S I   WS-C3850- Gig 1/1/1

 

Total cdp entries displayed : 11

 

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