I have this issue on a network where I keep getting these messages, and topology changes are happening rapidly.
_4th_3560X_1#debug spanning-tree bpdu _4th_3560X_1#term mon 4th_3560X_1# 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 no 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 s 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 no d 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 01 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0100 1400 0200 0F00ebug all All possible debugging has been turned off _4th_3560X_1# 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/23 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 F4 AC C1 07 D7 98 00 07 42 42 03 26w6d: STP: Data 00000080 26w6d: STP: VLAN0001 Gi0/23:0000 00 80 26w6d: STP: VLAN0001 Gi0/15 tx BPDU: tcn: 0000 00 80 26w6d: STP: VLAN0001 Gi0/23 tx BPDU: config protocol=ieee Data : 0000 00 00 81 8000000A04E2CDC0 00000013 8001001955DEA180 8017 0200 1400 0200 0F00 26w6d: STP: VLAN0001 rx BPDU: config protocol = ieee, packet from GigabitEthernet0/15 , linktype IEEE_SPANNING , enctype 2, encsize 17 26w6d: STP: enc 01 80 C2 00 00 00 00 0A 04 E2 CD CC 00 26 42 42 03 26w6d: STP: Data 00000000818000000A04E2CDC0000000008000000A04E2CDC0800C0000140002000F00 26w6d: STP: VLAN0001 Gi0/15:0000 00 00 81 8000000A04E2CDC0 00000000 8000000A04E2CDC0 800C 0000 1400 0200 0F00 26w6d: STP(1) port Gi0/15 supersedes 0
Any help with the troubleshooting would be great. I just need some new ideas.
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