7206VXR not tagging traffic with dot1q

Unanswered Question
Oct 10th, 2008

I have an interface set up like the following:

interface FastEthernet5/0

no ip address

duplex full


interface FastEthernet5/0.253

encapsulation dot1Q 253 native

ip address xxx.xxx.xxx.37


interface FastEthernet5/0.353

encapsulation dot1Q 353

ip address xxx.xxx.xxx.61


I cannot get the 7206 to tag traffic on the 353 VLAN.

If I do a ping xxx.xxx.xxx.62 (which should go out the 353 VLAN) my provider does not see any tagged traffic.

Why would the traffic not be being tagged??

Thank you.

I have this problem too.
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Giuseppe Larosa Sat, 10/11/2008 - 00:48

Hello James,

to troubleshoot use the following

sh vlan

shows counters for each defined vlan

term mon

debug vlan packets

then issue the ping and see the results

then again

sh vlan

In this way you can also verify if provider is using ISL instead of 802.1Q if so its device doesn't understand 802.1Q tags

Hope to help



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