[Bridge] STP bug, loop not detetcted

Jaime Nebrera
2008-05-07T09:33:02Z

Hi Joakim,

  I'm not aware if Linux bridge is aware of this. I can tell you that in
general, STP has problems when mixed with VLANs.

  To solve this some extensions have arised: PVST by Cisco, MSTP, an
improvement more or less estandarized and PVST+, a new update only
available in Cisco environments.

  In general they run multiple "STP" instances per VLAN or VLAN group.

  Regards

El mi?, 07-05-2008 a las 11:22 +0200, Joakim Tjernlund
escribi?:
> Got a bridge with 4 optical VLAN interfaces, eth1.1, eth1.2, eth1.3 and
> eth1.4, attached and the builtin STP enabled. eth1 is connected to
> a "switch" with 4 real interfaces, each real interface maps to
one of
> the above mentioned VLANs.
>
> If I loop two or more interfaces by connecting each interface's output
> to its own input, I get a loop that STP doesn't detect.
> Looping by connecting an output from one interface to another interface
> input works fine.
>
> Bug or limitation in STP? If limitation, would RSTP help here?
>
> Kernel 2.6.25
>
>  Jocke
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