On Tue, Mar 31, 2015 at 06:17:42PM +0000, Field, Brian wrote:
> I?m L2 challenged, so please forgive my lack of clue in this space.
Me too ;-)
> First, is CDP really a BPDU? It?s not performing any sort of spanning
> tree functionality so I question why OVS?s forwarding of CDP frames is
> tied to the bpdu-forwarding value. Is there a reason why CDP is included
> in the list protocols tied to bpdu-forwarding?
Thanks for the question.
CDP is not a BPDU. The option when originally proposed applied only
to STP BPDUs and other IEEE reserved protocols, but it was generalized
later to other protocols that should not be forwarded across switches.
I changed the introduction to: "Controls forwarding of BPDUs and other
network control frames when NORMAL action is invoked." to clarify.
> Is the following correct:
>
> If STP is enabled, then the setting for bpdu-forwarding has no effect. If
> STP is not enabled, then setting bpdu-forwarding to true causes OVS to
> forward BPDUs.
To be entirely pedantic:
If STP is enabled, then the setting for bpdu-forwarding has no effect
on STP BPDUs. If STP is not enabled, then setting bpdu-forwarding to
true causes OVS to forward BPDUs and other network control frames.
Thanks a lot for the questions! I'm happy that we managed to improve
the documentation here.
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