Understanding a Router's ARP Table

[Leroy Windfield]

In the following example:

R1#show arp

Protocol  Address          Age (min)  Hardware Addr   Type   Interface

Internet  10.0.0.1                -   0000.1111.1111  ARPA   FastEthernet0/0

Internet  10.0.0.2                0   0000.2222.2222  ARPA   FastEthernet0/0

What is the meaning of the "-" under the Age Entry for IP Address 10.0.0.1?  I assume that indicates the configured IP Address for Fa0/0 whereas the line for IP Address 10.0.0.2 indicates an ARP Entry for a remote device.  Trying to get a thorough understanding of how ARP works. 

[Jon Marshall]

I assume that indicates the configured IP Address for Fa0/0 whereas the line for IP Address 10.0.0.2 indicates an ARP Entry for a remote device.

Correct, the router will not have a timer associated with a directly connected interface because it never needs to age it out whereas it will with any remote devices.

Jon

[Leroy Windfield]

I haven't been able to find any documentation explicitly stating such. Thank you very much for your assistance!