Arp age time always 0

Hi,

When running everything on default , how is it possible that the device is accessible but the arp age remains 0 all the time?

 

The device is always accessible on ICMP and telnet but arp age remains 0 for ever.

Internet  172.31.39.57            0   0025.1234.5678  ARPA   Vlan61

 

Other devices are completely normal as below :

Internet  172.31.39.44           25   0025.1234.5678  ARPA   Vlan61
Internet  172.31.39.45           37   0025.1234.5678  ARPA   Vlan61
Internet  172.31.39.46           21   0025.1234.5678  ARPA   Vlan61
Internet  172.31.39.47           38   0025.1234.5678  ARPA   Vlan61
Internet  172.31.39.48           39   0025.1234.5678  ARPA   Vlan61
Internet  172.31.39.49           32   0025.1234.5678 ARPA   Vlan61

 

Am i missing something?

 

 

Thx.

 

 

Thx

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