[c-nsp] Untagged native VLAN...

Elmar K. Bins elmi at 4ever.de
Tue Nov 23 11:36:04 EST 2010


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)

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