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log help

the connections are always flapping,

what is the proble?thanks

2w4d: STP: VLAN0018 rx BPDU: config protocol = ieee, packet from FastEthernet0/24 , linktype SSTP , enctype 3, encsize 22

2w4d: STP: enc 01 00 0C CC CC CD 00 0D 28 8A CD B0 00 32 AA AA 03 00 00 0C 01 0B

2w4d: STP: VLAN0018 Fa0/24:0000 00 00 00 800000078578E290 00000008 8012000D288ACD80 8030 0200 1400 0200 0F00

2w4d: STP(18) port Fa0/24 supersedes 0

2w4d: STP: opt: VLAN0018: get ports: chunk 0 allocated

2w4d: STP: opt: VLAN0018: freeing opt chunk 0

2w4d: STP SW: RX ISR: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 128 len 64 on v128 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e2ad 00000008

2w4d: B:8080 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:0080

2w4d: STP SW: PROC RX: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 128 len 64 on v128 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e2ad 00000008

2w4d: B:8080 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:0080

2w4d: STP: VLAN0128 rx BPDU: config protocol = ieee, packet from FastEthernet0/24 , linktype SSTP , enctype 3, encsize 22

2w4d: STP: enc 01 00 0C CC CC CD 00 0D 28 8A CD B0 00 32 AA AA 03 00 00 0C 01 0B

2w4d: STP: Data 0000000000800000078578E2AD000000088080000D288ACD8080300200140002000F00

2w4d: STP: VLAN0128 Fa0/24:0000 00 00 00 800000078578E2AD 00000008 8080000D288ACD80 8030 0200 1400 0200 0F00

2w4d: STP(128) port Fa0/24 supersedes 0

2w4d: STP: opt: VLAN0128: get ports: chunk 0 allocated

2w4d: STP: opt: VLAN0128: freeing opt chunk 0

2w4d: STP SW: RX ISR: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 306 len 64 on v306 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e2be 00000008

2w4d: B:8132 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:0132

2w4d: STP SW: PROC RX: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 306 len 64 on v306 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e2be 00000008

2w4d: B:8132 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:0132

2w4d: STP: VLAN0306 rx BPDU: config protocol = ieee, packet from FastEthernet0/24 , linktype SSTP , enctype 3, encsize 22

2w4d: STP: enc 01 00 0C CC CC CD 00 0D 28 8A CD B0 00 32 AA AA 03 00 00 0C 01 0B

2w4d: STP: Data 0000000000800000078578E2BE000000088132000D288ACD8080300200140002000F00

2w4d: STP: VLAN0306 Fa0/24:0000 00 00 00 800000078578E2BE 00000008 8132000D288ACD80 8030 0200 1400 0200 0F00

2w4d: STP(306) port Fa0/24 supersedes 0

2w4d: STP: opt: VLAN0306: get ports: chunk 0 allocated

2w4d: STP: opt: VLAN0306: freeing opt chunk 0

2w4d: STP SW: RX ISR: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 108 len 64 on v108 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e29a 00000008

2w4d: B:806C 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:006C

2w4d: STP SW: PROC RX: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

2w4d: encap SNAP linktype sstp vlan 108 len 64 on v108 Fa0/24

2w4d: AA AA 03 00000C 010B SSTP

2w4d: CFG P:0000 V:00 T:00 F:00 R:8000 0007.8578.e29a 00000008

2w4d: B:806C 000d.288a.cd80 80.30 A:0200 M:1400 H:0200 F:0F00

2w4d: T:0000 L:0002 D:006C

2w4d: STP: VLAN0108 rx BPDU: config protocol = ieee, packet from FastEthernet0/24 , linktype SSTP , enctype 3, encsize 22

2w4d: STP: enc 01 00 0C CC CC CD 00 0D 28 8A CD B0 00 32 AA AA 03 00 00 0C 01 0B

2w4d: STP: VLAN0108 Fa0/24:0000 00 00

2 REPLIES

Re: log help

The above looks like a BPDU debug. Is the port flapping or the STP is flapping? Waht is fa 0/24 configured as? Is the port getting pvid-inconsistent or type-incosistent?

The debug show that port 0/24 received an SSTP type BPDU from 000d.288a.cdb0.

2w4d: STP: VLAN0018 rx BPDU: config protocol = ieee, packet from FastEthernet0/24 , linktype SSTP , enctype 3, encsize 22

2w4d: STP: enc 01 00 0C CC CC CD 00 0D 28 8A CD B0 00 32 AA AA 03 00 00 0C 01 0B

2w4d: STP: VLAN0018 Fa0/24:0000 00 00 00 800000078578E290 00000008 8012000D288ACD80 8030 0200 1400 0200 0F00

2w4d: STP(18) port Fa0/24 supersedes 0

2w4d: STP: opt: VLAN0018: get ports: chunk 0 allocated

2w4d: STP: opt: VLAN0018: freeing opt chunk 0

2w4d: STP SW: RX ISR: 0100.0ccc.cccd<-000d.288a.cdb0 type/len 0032

*Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address (also called the Shared Spanning Tree Protocol [SSTP] MAC address, 0100.0ccc.cccd), tagged with a corresponding IEEE 802.1Q VLAN tag.

If the Native VLAN on an IEEE 802.1Q trunk is not VLAN 1:

*VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag.

*VLAN 1 STP BPDUs are also sent to the IEEE STP MAC address on the Native VLAN of the IEEE 802.1Q trunk, untagged.

*Non-VLAN 1 STP BPDUs are sent to the PVST+ MAC address, tagged with a corresponding IEEE 802.1Q VLAN tag.

Note: Native VLAN STP BPDUs are sent untagged.

This way, VLAN 1 STP of PVST+ merges with STP of IEEE 802.1D or 802.1Q, while other VLANs are tunneled through the cloud of IEEE 802.1D or 802.1Q bridges. For example, the IEEE 802.1D or 802.1Q cloud looks similar to a ?wire? to the PVST+ VLANs other than 1.

For STP to operate correctly, observe certain rules when you connect PVST+ bridges to IEEE 802.1D or 802.1Q bridges. The main rule is that PVST+ bridges must connect to IEEE 802.1D or 802.1Q bridges through an IEEE 802.1Q trunk with a consistent Native VLAN on all bridges that connect to the cloud of IEEE 802.1Q or 802.1D bridges.

The PVST+ BPDU contains a VLAN number that allows PVST+ bridges to detect whether the previous rule is not respected. When a Catalyst switch detects a misconfiguration, the corresponding ports are put into a ?PVID-inconsistent? or ?type-inconsistent? state, which effectively blocks the traffic in the corresponding VLAN on a corresponding port. These states prevent forwarding loops that misconfigurations or miswiring cause.

For more information on troublehsooting STP:

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00801d11a0.shtml

Please rate all posts.

Re: log help

Hello,

what do you have connected to FastEthernet0/24 ? If this is another switch, try and set the port (on the other side as well) to fixed duplex and speed settings. What type of switch (and IOS version) is this anyway ? Can you post the configuration of the switch ?

Regards,

GNT

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