[Bridge] Re: PVST

Stephen Hemminger shemminger at linux-foundation.org
Fri Apr 27 11:48:14 PDT 2007

On 27 Apr 2007 15:43:00 +0200
Benny Amorsen <benny+usenet at amorsen.dk> wrote:

> >>>>> "SH" == Stephen Hemminger <shemminger at linux-foundation.org> writes:
> SH> Someone had sent some patches to do PVST, but PVST seems to be
> SH> Cisco centric. and the patched version was too inflexible, so I
> SH> didn't put it in mainline.
> PVST is indeed Cisco centric. It is also the only way to stay sane if
> you have several VLAN's.
> However, isn't PVST the same as making a br100 out of eth0.100 and
> eth1.100, and turning STP on? Hopefully the STP packets should then
> emerge with a VLAN tag of 100.
> /Benny
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The problem is if you bridge two vlan's then the Cisco box will
see two STP bpdu's arrive, and conclude that there is a cycle and
bring the link down.

Stephen Hemminger <shemminger at linux-foundation.org>

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