cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1164
Views
0
Helpful
0
Replies
Highlighted
Explorer

Configuring the ARP cache timeout for Cisco phones

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

CreatePlease to create content
Content for Community-Ad
August's Community Spotlight Awards