Hi All,
I am hoping to configure the ARP cache timeout for Cisco phones using the dhcp option.
I was wondering if anyone here has done it or can verify that this would be correct.
Say for example I have a DHCP pool named VOICE.
In this network, the CUCM is located at IP address 10.2.200.110
I did some google searching and found a Wiki site with the various dhcp options defined in it.
http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
According to the site, dhcp option 35 is used as the ARP Cache Timeout value and it is 4 bytes long.
Lets say that I would like to set my arp cache timeout to be 300 seconds.
I convert 300 to hex and get 12C.
Since my field will need to be four bytes long this becomes 0000.012C.
I think that the following dhcp pool will provide 300 seconds for the phone ARP cache timeout.
ip dhcp pool VOICE
network 10.240.1.0 255.255.255.0
default-router 10.240.1.1
option 150 ip 10.2.200.110
option 35 hex 0000.0c12
Can anyone help me out with a verification or point me in the direction of the appropiate documentation?
Many thanks for any assistance.
Regards
Amanda Lalli-Cafini
