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STP BPDU are not transited across the fabric, which can lead to Layer 2 instability. You can check for tx, but not rx bpdu, with the following command: show spanning internal info all | egrep 'bpdu_in|bpdu_out|Eth1'
3.2 software and Gen1 leaf switch This affects IEEE STP BPDUs such 802.1d, Rapid STP 802.1w, MST 802.1s. This does not affect Cisco PVST+ or rapid PVST+ which sends BPDUs with a destination MAC of 01:00:0c:cc:cc:cd
Use Cisco PVST+ or rapid PVST+, which sends BPDUs with a destination MAC of 01:00:0c:cc:cc:cd. or Upgrade to a release with the fix.
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