show devices info on Cisco Switch

AXISHK
AXISHK used Ask the Experts™
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Using sh arp in Cisco Switch, it lists out the following. Why does IP 10.50.10.2 get several different MAC addresses ? This IP has been reserved in DHCP and it shouldn't lease to the clients

10.50.10.2      34bb.1f59.70f1      Vlan3                        
10.50.10.2      285a.ebee.8c67      Vlan3                        
10.50.10.2      f01f.af1c.fcee       Vlan3                        
10.50.10.2      bc85.56bc.01c3      Vlan3                        
10.50.10.2      e82a.eadd.6d8c      Vlan3                        
10.50.10.2      5440.ade7.1180      Vlan3                        
10.50.10.2      5c26.0a80.bafb      Vlan3                        
10.50.10.2      bc85.56bc.01c4      Vlan3                        
10.50.10.2      f01f.af1c.fc3a       Vlan3                        

Using sh mac-address-table, a port display several MAC addresses as well. Under what condition should the output appear like this ?

   cc29.f5bd.c660    DYNAMIC     Gi1/0/2
   cc3a.6184.2d0e    DYNAMIC     Gi1/0/2
   cc3d.82bd.b14f    DYNAMIC     Gi1/0/2
   cc3d.82bf.f1f8    DYNAMIC     Gi1/0/2
   cc3d.82bf.f1fd    DYNAMIC     Gi1/0/2
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Probably because 10.50.10.2 works as default getaway, so every arp lookup towards network behind it - create such arp entry.

Author

Commented:
Will that also happen for a DHCP server ? Tks
Distinguished Expert 2018

Commented:
Using sh mac-address-table, a port display several MAC addresses as well. Under what condition should the output appear like this ?

   cc29.f5bd.c660    DYNAMIC     Gi1/0/2
   cc3a.6184.2d0e    DYNAMIC     Gi1/0/2
   cc3d.82bd.b14f    DYNAMIC     Gi1/0/2
   cc3d.82bf.f1f8    DYNAMIC     Gi1/0/2
   cc3d.82bf.f1fd    DYNAMIC     Gi1/0/2
This is typical for trunks. or ports where you have switch attached even as access port. Many devices are accessible through Gi1/02 port.
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Author

Commented:
Will DHCP server be observed with the attached result ? Tks
Distinguished Expert 2018
Commented:
DHCP server would banging head on the wall with having such associations, so I guess not. :)

Author

Commented:
Tks

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