[c-nsp] Native VLAN and DHCP

[Arie Vayner (avayner)]

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
http://uplogon.com | +1 906 774 4847 | chris at uplogon.com
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