--On 30 July 2014 13:26 +0400 Hrant Dadivanyan <hr...@dadivanyan.net> wrote:

Hi Karl,

I'm not sure whether it's on by default, but many Cisco switches
(including all in 3750 family) can tag native vlan, so no a packet will
leave ports untagged.
    no vlan dot1q tag native
in configuration mode will switch this off.

Thanks to all that replied - the issue in the end was a switch config issue (as suspected - i.e. not an O/S issue). Something to do with QinQ being setup on it - and the switch then not de-tagging native trunk vlan's...

I'm not setting up the switches - so I don't know for sure what config option was changed (i.e. the one above?), but it is resolved now.

Thanks again,

-Karl
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