[Bridge] STP bug, loop not detetcted
richardvoigt at gmail.com
richardvoigt at gmail.com
Wed May 7 19:16:18 PDT 2008
On Wed, May 7, 2008 at 9:22 AM, Joakim Tjernlund
<joakim.tjernlund at transmode.se> wrote:
> 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?
Limitation in STP.
If a bridge receives one of its own STP packets on the same interface
from which it was sent, that indicates a loop elsewhere in the network
that disabling an interface locally will not fix, therefore STP takes
no action.
>
> Kernel 2.6.25
>
> Jocke
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