Messages in this thread | | | Date | Sun, 4 Jun 2023 12:23:04 +0300 | From | Vladimir Oltean <> | Subject | Re: [PATCH net-next 27/30] net: dsa: mt7530: introduce BPDU trapping for MT7530 switch |
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On Sun, Jun 04, 2023 at 11:51:33AM +0300, Arınç ÜNAL wrote: > > If the switch doesn't currently trap BPDUs, isn't STP broken? > > No, the BPDU_PORT_FW bits are 0 after reset. The MT7620 programming guide > states that frames with 01:80:C2:00:00:00 MAC DA (which is how the BPDU > distinction is being made) will follow the system default which means the > BPDUs will be treated as normal multicast frames. > > Only if all 3 bits are set will the BPDUs be dropped.
Right, if you don't trap BPDUs just to the CPU but flood them, I believe the STP protocol won't behave properly with switching loops. Worth testing.
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