[c-nsp] VLAN mystery

Saku Ytti saku at ytti.fi
Mon Oct 19 04:50:34 EDT 2015


On 16 October 2015 at 21:32, B <rbf+cisco-nsp at panix.com> wrote:

Hey,

>> switchport trunk encapsulation dot1q is missing on the port on second switch.
>
> After seeing that many times, I'm compelled to ask:  Are people reading
> the problem description before responding?  One of the VLANs works, the
> other VLAN doesn't, neither VLAN is native.  That's not what an ISL vs.
> 802.1Q mismatch gets you.

I believe Andrew is right and actually read the problem. B is 2924XL,
which by default uses ISL encapsulation in port Fa0/17. So second link
between A-B switches has encapsulation mismatch.

-- 
  ++ytti


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