Re: [Bridge] Bridge question

[Hai Wang <u2.ireland@gmail.com>]

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Hello Stephen,
  I was not talking about nested bridges, I meant all bridges created on one
Linux are independent. As matter of fact, brctl does not allow to add a
bridge to another bridge.
  In my case, I have 10 BR2684 interfaces and eth0 on one linux PC with the
same MAC address, nas0....nas9.
  I create two bridges br0 and br1, and add nas0....nas5 and eth0.32 (VLAN)
into br0, and add nas6..nas9 and eth0.33 into br1, as I mentioned above,
nas0...nas9 have the same MAC whereas eth0.32 and eth0.32 also share a MAC,
so br0 and br1 have the same Bridge ID, do you think that the scenario will
work?
  Thanks!
 Regards!
              I am not talking about nested

 On 11/4/05, Stephen Hemminger <shemminger@osdl.org> wrote:
>
> On Fri, 4 Nov 2005 08:19:35 -0500
> Hai Wang <u2.ireland@gmail.com> wrote:
>
> > Stephen,
> > Since your trick is using 2 (even 4) priority bits, do you think it
> could
> > cause some cmpatibility issue with other STP implementation which still
> uses
> > these bits? (it seems to me that port priority is local significant.
> maybe
> > we can use all 8 bits for port ID, can't we?)
> > If we take other approaches, like create more than one bridges on one
> > Linux box, I am not sure if it is feasible, since I saw all bridges
> created
> > on the box have the same bridge ID.
> > Thanks!
>
> The port id is treated as a 16 bit ordered field by STP. So the other
> side won't have any problem. Nested bridge's won't work for a bunch of
> implementation related reasons, it's not impossible to change to allow
> that just a lot of work getting rid of all the possible race issues.
>
> The bridge id comes from the Mac of the first interface in bridge.
> So if you have mulitple bridges they all would have different bridge ids.
>
>
> --
> Stephen Hemminger <shemminger@osdl.org>
> OSDL http://developer.osdl.org/~shemminger
>

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