[c-nsp] Native VLAN and DHCP

[Chris Gotstein]

According to HP, the dhcp request is untagged.  I will try running a 
sniffer to see what's going on.

The controller is acting as the DHCP server on vlan 3 just for the APs. 
  I had also tried using the MS DHCP server for the APs, but that had 
the same results as well.

On 4/30/2010 6:04 AM, Arie Vayner (avayner) wrote:
> Chris,
>
> To my understanding, this should work...
> Are you sure the AP is sending the DHCP request untagged?
> BTW, you mentioned the AP is acting as DHCP *server* - is it server or
> client?
>
> I would suggest that you just SPAN the port of the AP and put a sniffer
> on it so you can see what is going on during the boot up process.
>
> Arie
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Chris Gotstein
> Sent: Friday, April 30, 2010 00:33
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Native VLAN and DHCP
>
> I've got a WS-C3560G-24TS switch doing L3.  We are running multiple
> VLANs, each VLAN has it's own subnet, and the clients are getting their
> IP addresses from a MS DHCP server using ip helper-address command for
> each VLAN interface.
>
> Problem:
>
> Setting up HP access points and controller.  Want to use VLAN 3 as the
> native VLAN for the HP APs.  Port that the AP is connected to is
> configured as the following:
>
> interface GigabitEthernet0/13
>   description Connect to HP AP
>   switchport trunk encapsulation dot1q
>   switchport trunk native vlan 3
>   switchport trunk allowed vlan 3,10,20,25,100
>   switchport mode trunk
>
> The controller is acting as the DHCP server, which is also on VLAN 3.
> But when the AP boots up, it takes a long time for it to get an IP
> address, and when it does finally get one, it's from a random VLAN of
> the listed allowed VLANs, and not from VLAN 3.  I'm not sure if i'm
> missing something or if i'm just unable to use the native vlan command
> in this fashion.  Any advice?  Thanks.
>

-- 
Chris Gotstein
Sr Network Engineer
UP Logon/Computer Connection UP
500 N Stephenson Ave
Iron Mountain, MI 49801
Phone: 906-774-4847
Fax: 906-774-0335
chris at uplogon.com