Just wondering why, when i do show arp, in my WS-C4506, whith Supervisor II+ 1000BaseX, and cat4000-i9k91s-mz.122-25.EWA5.bin, it seems that i have +/- 20 % of arp entrys with the aging time of 0 sec all the time.
I think it should increment that aging time till 300 sec (by default), and then reset, but not all the entries do it.
Any ideias of what kind of "process" is causing it ?
I have all in the vlan1, and the ip's that soffer this issue are hosts and Cisco equipments.
The age column in the show arp command indicates the interval (in minutes) since the entry was entered in the table, rather than the interval since the entry was last used. The first time device receives an ARP for a particular device it will enter it in the ARP table and will start the age counter. The default arp timeout value is 4 hours. If you issue the clear arp-cache command, the device sends out ARP requests to all the devices listed in the ARP table. If it receives a reply, it keeps the entry in the table but resets the age (min) value to zero.
If it does not receive the reply then it removes the entry from the ARP table. Also, make sure that the encapsulation type between the neighboring devices matches. If it is not, hardcode the encapsulation type
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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