encapsulation dot1q

[ney25]

Dear NetPro,

i need some expert to advice, when i put encapsulation dot1q and trunk in the switch port. i totally can't get any ip address assign by Access Point. and when i remove the encapsulation dot1q and trunk. i am able to get ip . what does it mean actually ? configuration as below,

example1:

---------------------------------

int fa 2/1

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,210

switchport mode trunk

*************************************

Example2

----------

int fa 2/1

switchport access vlan 210

switchport mode access

***********************************

your reply will be highly appreciated,

Regards,

Jack

[kka]

Add "switchport trunk native vlan 210" to your trunk configuration

in example 1. The (invisible) default makes VLAN 1 native, which means

frames in VLAN 210 are tagged and devices without trunk configuration

or a different native VLAN won't accept these frames.

Do you also have a dot1q-trunk configured on the AP?

[ney25]

Hi kka,

yes, i've added the "switchport trunk native vlan210" in the switch, but where do i add dot1q-trunk configured on the AP ? as i am using Aironet Access Point 1200 Series.

regards,

Jack

[nelson-rick]

Put the IP address on the BVI1 interface and that should fix your problem. The dot1q trunking should be taking place on the subinterfaces.

[ney25]

Hi Netpro,

yes,i was put the ip address to the BV1 interface, but then i got lot of hostflapping between the switchport to switchport. mind to guide me how to solve the hostflapping issue ?

Regards,

Jack