Option 43 for DHCP Server

[jnzy111]

I'm trying to configure option 43 for our optipoint 420 phones (Hipath 4000 V2) and setup a voice vlan.

My Vlan is 666, however according to the hex converter I use it is 29A in hex so I tried the following:

01 0A 53 69 65 6D 65 6E
73 00 00 00 02 04 00 00
00 29A 00 00 00 00 00 FF

Due to the 3 digits of 29A, the option cant be set..

Any one know of a solution to define vlan 666 as my voice vlan?

---Mike

 

[Bas1234]

Did you have a look here?

http://wiki.siemens-enterprise.com/index.php/VLAN_ID_Discovery_over_DHCP

___________________________________________
It works! Now if only I could remember what I did...

Dain Bramaged
___________________________________________

 

[jnzy111]

Yes, I did and it's a great example if my vlan were 100 or under, however my voice vlan is 666 which translates to:

00 00 00 29A

The problem is that "29A" won't go into the DHCP server options due to the 3 digits.

Still looking for the solution to identify vlan 666 in my option 43....

 

[Bas1234]

I haven't read the whole lot there, but is your DHCP server in the VLAN666 or is it in the Default or other VLAN?

If it's in a default or other VLAN then you'll need to do a route add command from a dos box.
And your one of your switches needs a L3 switch that can do VLAN routing.
Say your DHCP on the default VLAN is 192.168.1.0/24
and the scope on VLAN666 192.168.6.0/24
If so then do the following.

open a dos box and typ;

route add 192.168.6.0 mask 255.255.255.0 192.168.1.x -p

192.168.1.x is your routing switch, and the -p is to make it permanent, so if you don't use -p then it will loose the route after rebooting or disconneting the LAN cable.

___________________________________________
It works! Now if only I could remember what I did...

Dain Bramaged
___________________________________________

 

[DennyHeack]

Wouldnt this work:

01 0A 53 69 65 6D 65 6E 73 00 00 00 02 04 00 00 02 9A 00 00 00 00 00 FF

 

[juldal]

Hello

There are only 255 possible vlans, therefore 666 is not a valid vlan ID.

you must choose between 1 and 255

 

[jnzy111]

Hi Denny - I thought that would work too, however when you run it through the hex converter at

http://www.easycalculation.com/hex-converter.php

it translates to decimal 8346

Bas1234 - Thanks but routing is not an issue at all, we have a fully implemented OSPF infrastructure and I have verified routing is good between the two different subnets and back.

Juldal - we are running Cisco IOS 12.x on a catalyst 4506 where the maximum number of vlans is actually 1005

Still looking for a solution :-(

 

[dneis]

Hello did you find your solution?
I am not using option 43 as this is the worst thing you can use, VLAN Discovery by DHCP works and I am using vlan 1118 for exemple (not on cisco but nortel switch) so you can configure that on a Win2003 DHCP server.

let me know