[c-nsp] Spanning Tree works great - except when it doesn't

[Lee]

>> The downstream switchport was also configured for native vlan of 999 - BUT
>> vlan999 was not created in the vlan database so defaulted to ...

Does anyone know of a program that will check all of the trunk ports
on switches for vlans allowed + vlans allowed and active on both sides
of a trunk port?

Seems like it shouldn't be all _that_ hard to write, but downloading
an already written program is easier still :)

Thanks,
Lee



On 10/15/15, Patrick M. Hausen <hausen at punkt.de> wrote:
> Hi, Nick,
>
>> Am 15.10.2015 um 13:43 schrieb Nick Cutting <ncutting at edgetg.co.uk>:
>> I came across a curly one like this a few months back - turned out the STP
>> handling of native VLan frames VS a non-created but configured native vlan
>> on the downstream switch port.
>> The downstream switchport was also configured for native vlan of 999 - BUT
>> vlan999 was not created in the vlan database so defaulted to expecting STP
>> frames untagged I think - it was something like that.
>
> You nailed it! for some reason that I now need to investigate
> I do not have VLAN 999 in my VLAN database.
>
> *argh*
>
> Thanks, everyone.
> Patrick
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