[c-nsp] Untagged native VLAN...

[Christopher J. Wargaski]

I think that you are missing the "switchport voice vlan 498"
configuration statement. Here is an example of a port on a 3560 with a
Cisco IP phone.


 switchport mode access
 switchport voice vlan 22
 srr-queue bandwidth share 10 10 60 20
 srr-queue bandwidth shape  10  0  0  0
 queue-set 2
 priority-queue out
 mls qos trust device cisco-phone
 mls qos trust cos
 auto qos voip cisco-phone
 spanning-tree portfast


cjw



> Date: Tue, 23 Nov 2010 17:36:04 +0100
> From: "Elmar K. Bins" <elmi at 4ever.de>
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Untagged native VLAN...
> Message-ID: <20101123163603.GC26330 at ronin.4ever.de>
> Content-Type: text/plain; charset="us-ascii"
>
> After a lot of fiddling around and getting nowhere, I'll ask you :)
>
> I am trying to set up a test port - for an IP phone actually - with
> the office WS VLAN (402) native untagged, and the Voice VLAN (498)
> tagged on this 3560-48 (12.2(25)SEE4).
>
> My config looks like this:
>
> #sh run int f0/44
> interface FastEthernet0/44
>  description ekb Testport
>  switchport access vlan 402
>  switchport trunk encapsulation dot1q
>  switchport trunk native vlan 402
>  switchport trunk allowed vlan 498
>  switchport mode trunk
>  load-interval 30
> end
>
> #sh vlan dot1q tag native
> dot1q native vlan tagging is disabled
>
> #sh int f0/44 switchport
> Name: Fa0/44
> Switchport: Enabled
> Administrative Mode: trunk
> Operational Mode: trunk
> Administrative Trunking Encapsulation: dot1q
> Operational Trunking Encapsulation: dot1q
> Negotiation of Trunking: On
> Access Mode VLAN: 402 (VL-workstation)
> Trunking Native Mode VLAN: 402 (VL-workstation)
> Administrative Native VLAN tagging: enabled             # !!!
> Voice VLAN: none
> Administrative private-vlan host-association: none
> Administrative private-vlan mapping: none
> Administrative private-vlan trunk native VLAN: none
> Administrative private-vlan trunk Native VLAN tagging: enabled
> Administrative private-vlan trunk encapsulation: dot1q
> Administrative private-vlan trunk normal VLANs: none
> Administrative private-vlan trunk private VLANs: none
> Operational private-vlan: none
> Trunking VLANs Enabled: 498
> Pruning VLANs Enabled: 2-1001
> Capture Mode Disabled
> Capture VLANs Allowed: ALL
>
> Protected: false
> Unknown unicast blocked: disabled
> Unknown multicast blocked: disabled
> Appliance trust: none
>
>
> The "enabled" in the output seems to be the show's mistake, if
> a few web pages are to be believed, but...
>
> The trunk link to the phone works nicely, but connecting a stupid
> win xp laptop (phone removed from in between) does not seem to work.
>
> Wireshark shows me outgoing broadcast packets (DHCP queries) from
> my laptop untagged. I see no responses coming in though.
>
> Does anyone have an idea where I could find the culprit...?
>
> Cheers,
>        Elmar.
>
> --
>
> "Machen Sie sich erst einmal unbeliebt. Dann werden Sie auch ernstgenommen."
>                                                             (Konrad Adenauer)
>