[c-nsp] bpduguard and trunks?

[Renelson Panosky]

I had a similar problem and yes BPDUGUARD effects trunk port, i think you
have to disable bpduguard on both side and make sure you're running rpst
mode.

On Thu, Dec 3, 2009 at 9:29 AM, Howard Jones <howie at thingy.com> wrote:

> I've just run into an odd problem, and was wondering if anyone else
> could clarify this for me.
>
> [c1]---[Sw1]----------[Sw2]---[c2]
>
> c1 and c2 are client devices. Sw1 and Sw2 are 3750Gs with a trunk
> between them. c1 has a trunk to Sw1. One of the vlans in that trunk as
> passed along the sw1-sw2 trunk to c2.
>
> The port facing c1 has bpduguard enabled. Halfway through adding vlans,
> Sw2 complains about inconsistent BPDUs, and the root bridge mac address
> is that of c1. It shuts down the trunk port, which is kind of annoying.
>
> Does bpduguard only affect access ports and not trunks? That's the only
> explanation I can see for what is going on. The manual doesn't exactly
> say either way: "At the interface level, you enable BPDU guard on any
> interface by using the spanning-tree bpduguard enable interface
> configuration command without also enabling the Port Fast feature.". Sw1
> also has '|no spanning-tree vlan 1-4090|' - will that help or hinder, here?
>
> I think the real answer is to stop using switches to ship stuff between
> sites like this, but that is a battle for another day.
>
> Thanks in advance for any illumination...
>
> Howie
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