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

[Jason Lixfeld]

You could use RANCID, or you could use something like Ansible.  Bronwyn and Matt did a great NetDevOps presentation that described how you could use Ansible for things like that in Montreal a couple weeks back.

https://www.youtube.com/watch?v=ArqvSGRzUBw

> On Oct 15, 2015, at 8:23 PM, Lee <ler762 at gmail.com> wrote:
> 
>>> 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
>> --
>> punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe
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>> 
>> 
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