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tech:network:cisco:stp:bpdufilter:bpdufilter

STP: BPDU Filter

Topology

Log

ASW1#debug spanning-tree events 
Spanning Tree event debugging is on
ASW1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
ASW1(config)#   
*Mar  1 01:52:20.875: STP: VLAN0001 heard root     1-0026.ca6b.e980 on Fa0/8
*Mar  1 01:52:20.875:     supersedes 32769-0022.bd89.2180
*Mar  1 01:52:20.875: STP: VLAN0001 new root is 1, 0026.ca6b.e980 on port Fa0/8, cost 19
ASW1(config)#do sh span

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             Cost        19
             Port        8 (FastEthernet0/8)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/6               Desg FWD 19        128.6    P2p 
Fa0/8               Root FWD 19        128.8    P2p 


ASW1(config)#do debug spanning-tree ?
  all              All Spanning Tree debugging messages
  backbonefast     BackboneFast events
  bpdu             Spanning tree BPDU 
  bpdu-opt         Optimized BPDU handling
  config           Spanning tree config changes
  csuf/csrt        STP CSUF/CSRT
  etherchannel     EtherChannel support
  events           Spanning tree topology events
  exceptions       Spanning tree exceptions
  general          Spanning tree general
  mstp             MSTP debug commands
  pvst+            PVST+ events
  root             Spanning tree root events
  snmp             Spanning Tree SNMP handling
  switch           Switch Shim debug commands
  synchronization  STP state sync events
  uplinkfast       UplinkFast events

ASW1(config)#do debug spanning-tree events ?
  dump      Dump BPDUs that are triggering events
  snapshot  Snapshot of all ports after an event
  <cr>

ASW1(config)#                              
*Mar  1 01:55:06.282: STP: VLAN0001 sent Topology Change Notice on Fa0/8
*Mar  1 01:55:06.282: STP[1]: Generating TC trap for port FastEthernet0/6
*Mar  1 01:55:07.288: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 01:55:08.286: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 01:56:26.988: set portid: VLAN0001 Fa0/6: new port id 8006
*Mar  1 01:56:26.997: STP: VLAN0001 Fa0/6 -> listening
ASW1(config)#
*Mar  1 01:56:28.993: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to up
ASW1(config)#
*Mar  1 01:56:30.000: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
ASW1(config)#
*Mar  1 01:56:42.004: STP: VLAN0001 Fa0/6 -> learning
ASW1(config)#
*Mar  1 01:56:57.011: STP[1]: Generating TC trap for port FastEthernet0/6
*Mar  1 01:56:57.011: STP: VLAN0001 sent Topology Change Notice on Fa0/8
*Mar  1 01:56:57.011: STP: VLAN0001 Fa0/6 -> forwarding
ASW1(config)#spa
ASW1(config)#spanning-tree por
ASW1(config)#spa                    
ASW1(config)#int f0/6      
ASW1(config-if)#spa
ASW1(config-if)#spanning-tree bpdufi
ASW1(config-if)#spanning-tree bpdufilter en
ASW1(config-if)#spanning-tree bpdufilter enable 
ASW1(config-if)#no spanning-tree bpdufilter enable 
ASW1(config-if)#por
ASW1(config-if)#spa
ASW1(config-if)#spanning-tree por
ASW1(config-if)#spanning-tree portfa
ASW1(config-if)#spanning-tree portfast ?
  disable  Disable portfast for this interface
  trunk    Enable portfast on the interface even in trunk mode
  <cr>

ASW1(config-if)#spanning-tree portfast 
%Warning: portfast should only be enabled on ports connected to a single
 host. Connecting hubs, concentrators, switches, bridges, etc... to this
 interface  when portfast is enabled, can cause temporary bridging loops.
 Use with CAUTION

%Portfast has been configured on FastEthernet0/6 but will only
 have effect when the interface is in a non-trunking mode.
ASW1(config-if)#
*Mar  1 02:02:27.363: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
ASW1(config-if)#
*Mar  1 02:02:28.361: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
ASW1(config-if)#
*Mar  1 02:02:34.443: set portid: VLAN0001 Fa0/6: new port id 8006
*Mar  1 02:02:34.443: STP: VLAN0001 Fa0/6 ->jump to forwarding from blocking
ASW1(config-if)#
*Mar  1 02:02:36.439: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to up
ASW1(config-if)#
*Mar  1 02:02:39.325: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
*Mar  1 02:02:40.080: set portid: VLAN0001 Fa0/6: new port id 8006
*Mar  1 02:02:40.088: STP: VLAN0001 Fa0/6 ->jump to forwarding from blocking
ASW1(config-if)#
*Mar  1 02:02:42.085: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to up
*Mar  1 02:02:43.092: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
ASW1(config-if)#spa
ASW1(config-if)#spanning-tree bpdu
ASW1(config-if)#spanning-tree bpdufi
ASW1(config-if)#spanning-tree bpdufilter en
ASW1(config-if)#spanning-tree bpdufilter enable 
ASW1(config-if)#do sh spanning-tree   

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             Cost        19
             Port        8 (FastEthernet0/8)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/6               Desg FWD 19        128.6    P2p Edge 
Fa0/8               Root FWD 19        128.8    P2p 


ASW1(config-if)#int f0/8
ASW1(config-if)#spa
ASW1(config-if)#spanning-tree bpdufil
ASW1(config-if)#spanning-tree bpdufilter en
ASW1(config-if)#spanning-tree bpdufilter enable 
ASW1(config-if)#do 
*Mar  1 02:05:51.818: STP: VLAN0001 heard root 32769-e8ed.f315.9380 on Fa0/1
*Mar  1 02:05:51.827: STP: VLAN0001 heard root 32769-c08c.6045.5200 on Fa0/2
ASW1(config-if)#      
*Mar  1 02:05:54.822: STP: VLAN0001 Topology Change rcvd on Fa0/1
*Mar  1 02:05:54.830: STP: VLAN0001 Topology Change rcvd on Fa0/2
ASW1(config-if)#sh sp
ASW1(config-if)#do sh spanning-tree

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     0022.bd89.2180
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/6               Desg FWD 19        128.6    P2p Edge 
Fa0/8               Desg FWD 19        128.8    P2p 


ASW1(config-if)#no spa
ASW1(config-if)#no spanning-tree bpdufi
ASW1(config-if)#no spanning-tree bpdufilter ena
ASW1(config-if)#no spanning-tree bpdufilter enable
ASW1(config-if)#no spanning-tree bpdufilter enable
ASW1(config-if)#int f0/8
*Mar  1 02:07:33.094: STP: VLAN0001 heard root     1-0026.ca6b.e980 on Fa0/8
*Mar  1 02:07:33.094:     supersedes 32769-0022.bd89.2180
*Mar  1 02:07:33.094: STP: VLAN0001 new root is 1, 0026.ca6b.e980 on port Fa0/8, cost 19
ASW1(config-if)#int f0/6
ASW1(config-if)#do sh spanning-tree               

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             Cost        19
             Port        8 (FastEthernet0/8)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/6               Desg FWD 19        128.6    P2p Edge 
Fa0/8               Root FWD 19        128.8    P2p 


ASW1(config-if)#int f0/8
ASW1(config-if)#spa
ASW1(config-if)#spanning-tree por
ASW1(config-if)#spanning-tree portfa
ASW1(config-if)#spanning-tree portfast 
%Warning: portfast should only be enabled on ports connected to a single
 host. Connecting hubs, concentrators, switches, bridges, etc... to this
 interface  when portfast is enabled, can cause temporary bridging loops.
 Use with CAUTION

%Portfast has been configured on FastEthernet0/8 but will only
 have effect when the interface is in a non-trunking mode.
ASW1(config-if)#int f0/6
ASW1(config-if)#no spa
ASW1(config-if)#no spanning-tree en
ASW1(config-if)#no spanning-tree bpdufi
ASW1(config-if)#no spanning-tree bpdufilter enable
ASW1(config-if)#
*Mar  1 02:09:12.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
ASW1(config-if)#
*Mar  1 02:09:13.850: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to down
ASW1(config-if)#
*Mar  1 02:09:30.358: STP: VLAN0001 heard root 32769-c08c.6045.5200 on Fa0/2
*Mar  1 02:09:30.358: STP: VLAN0001 heard root 32769-e8ed.f315.9380 on Fa0/1
*Mar  1 02:09:30.895: STP: VLAN0001 Topology Change rcvd on Fa0/1
*Mar  1 02:09:30.895: STP: VLAN0001 Topology Change rcvd on Fa0/2
ASW1(config-if)#exit
ASW1(config)#spa
ASW1(config)#spanning-tree port
ASW1(config)#spanning-tree portfast bpdu
ASW1(config)#spanning-tree portfast bpdufi
ASW1(config)#spanning-tree portfast bpdufilter dea
ASW1(config)#spanning-tree portfast bpdufilter defau
ASW1(config)#spanning-tree portfast bpdufilter default 
ASW1(config)#no spanning-tree portfast bpdufilter default 
ASW1(config)#spanning-tree portfast bpdufilter default    
*Mar  1 02:10:39.221: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:10:40.227: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
ASW1(config)#spanning-tree portfast bpdufilter default 
*Mar  1 02:10:40.865: set portid: VLAN0001 Fa0/5: new port id 8005
*Mar  1 02:10:40.865: STP: VLAN0001 Fa0/5 -> listening
ASW1(config)#spanning-tree portfast bpdufilter default 
*Mar  1 02:10:41.225: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
ASW1(config)#spanning-tree portfast bpdufilter default 
*Mar  1 02:10:42.861: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to up
*Mar  1 02:10:43.868: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to up
ASW1(config)#spanning-tree portfast bpdufilter default 
ASW1(config)#
*Mar  1 02:10:55.872: STP: VLAN0001 Fa0/5 -> learning
ASW1(config)#
*Mar  1 02:11:10.879: STP[1]: Generating TC trap for port FastEthernet0/5
*Mar  1 02:11:10.879: STP: VLAN0001 Fa0/5 -> forwarding
ASW1(config)#
*Mar  1 02:11:34.938: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:11:34.938: STP[1]: Generating TC trap for port FastEthernet0/5
*Mar  1 02:11:35.944: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to down
ASW1(config)#
*Mar  1 02:11:36.943: set portid: VLAN0001 Fa0/6: new port id 8006
*Mar  1 02:11:36.943: STP: VLAN0001 Fa0/6 ->jump to forwarding from blocking
ASW1(config)#
*Mar  1 02:11:36.943: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to down
ASW1(config)#
*Mar  1 02:11:38.939: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to up
ASW1(config)#
*Mar  1 02:11:39.946: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
ASW1(config)#
*Mar  1 02:12:33.859: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:12:34.866: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 02:12:35.864: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 02:12:37.424: set portid: VLAN0001 Fa0/6: new port id 8006
*Mar  1 02:12:37.424: STP: VLAN0001 Fa0/6 ->jump to forwarding from blocking
ASW1(config)#
*Mar  1 02:12:39.421: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to up
*Mar  1 02:12:40.428: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
ASW1(config)#
*Mar  1 02:13:09.536: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:13:10.543: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 02:13:11.306: set portid: VLAN0001 Fa0/5: new port id 8005
*Mar  1 02:13:11.306: STP: VLAN0001 Fa0/5 -> listening
ASW1(config)#
*Mar  1 02:13:11.541: %LINK-3-UPDOWN: Interface FastEthernet0/6, changed state to down
ASW1(config)#
*Mar  1 02:13:13.303: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to up
ASW1(config)#
*Mar  1 02:13:14.309: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to up
ASW1(config)#
*Mar  1 02:13:26.313: STP: VLAN0001 Fa0/5 -> learning
ASW1(config)#
*Mar  1 02:13:41.320: STP[1]: Generating TC trap for port FastEthernet0/5
*Mar  1 02:13:41.320: STP: VLAN0001 Fa0/5 -> forwarding
ASW1(config)#
*Mar  1 02:13:58.257: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:13:58.257: STP[1]: Generating TC trap for port FastEthernet0/5
ASW1(config)#
*Mar  1 02:13:59.264: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to down
*Mar  1 02:13:59.901: set portid: VLAN0001 Fa0/8: new port id 8008
*Mar  1 02:13:59.910: STP: VLAN0001 Fa0/8 ->jump to forwarding from blocking
ASW1(config)#
*Mar  1 02:14:00.262: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to down
ASW1(config)#
*Mar  1 02:14:01.906: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to up
*Mar  1 02:14:02.913: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up
ASW1(config)#
*Mar  1 02:14:32.978: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:14:33.984: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
ASW1(config)#
*Mar  1 02:14:34.982: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to down
ASW1(config)#
*Mar  1 02:14:38.866: set portid: VLAN0001 Gi0/1: new port id 8009
*Mar  1 02:14:38.866: STP: VLAN0001 Gi0/1 -> listening
ASW1(config)#
*Mar  1 02:14:40.863: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
*Mar  1 02:14:41.869: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
ASW1(config)#
*Mar  1 02:14:53.874: STP: VLAN0001 Gi0/1 -> learning
ASW1(config)#
*Mar  1 02:15:08.881: STP[1]: Generating TC trap for port GigabitEthernet0/1
*Mar  1 02:15:08.881: STP: VLAN0001 Gi0/1 -> forwarding
ASW1(config)#
*Mar  1 02:16:19.462: set portid: VLAN0001 Fa0/8: new port id 8008
*Mar  1 02:16:19.462: STP: VLAN0001 Fa0/8 ->jump to forwarding from blocking
ASW1(config)#
*Mar  1 02:16:21.459: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to up
*Mar  1 02:16:22.466: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up
ASW1(config)#spanning-tree portfast bpdufilter default 
ASW1(config)#                                             
*Mar  1 02:17:00.944: STP: VLAN0001 heard root 32769-0026.ca6b.e980 on Fa0/8
*Mar  1 02:17:00.944: STP: VLAN0001 Topology Change rcvd on Fa0/8
ASW1(config)#do sh span                                   

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     0022.bd89.2180
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/8               Desg FWD 19        128.8    P2p 
Gi0/1               Desg FWD 4         128.9    P2p 


ASW1(config)#moni
ASW1(config)#monitor sess
ASW1(config)#monitor session 1 sou
ASW1(config)#monitor session 1 source inter
ASW1(config)#monitor session 1 source interface f0/8  
ASW1(config)#moni
ASW1(config)#monitor sess
ASW1(config)#monitor session 1 des
ASW1(config)#monitor session 1 destination int gig0/1 en
ASW1(config)#monitor session 1 destination int gig0/1 encapsulation rep
ASW1(config)#$sion 1 destination int gig0/1 encapsulation replicate 
ASW1(config)#
*Mar  1 02:20:56.027: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:20:56.027: STP[1]: Generating TC trap for port GigabitEthernet0/1
ASW1(config)#
*Mar  1 02:23:21.846: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:23:21.846: STP[1]: Generating TC trap for port FastEthernet0/8
*Mar  1 02:23:22.852: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
ASW1(config)#
*Mar  1 02:23:23.859: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to down
ASW1(config)#
*Mar  1 02:23:27.575: set portid: VLAN0001 Fa0/8: new port id 8008
*Mar  1 02:23:27.575: STP: VLAN0001 Fa0/8 ->jump to forwarding from blocking
ASW1(config)#
*Mar  1 02:23:29.572: %LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to up
*Mar  1 02:23:30.578: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up
ASW1(config)#                                                       
*Mar  1 02:25:01.259: STP: VLAN0001 heard root 32769-0026.ca6b.e980 on Fa0/8
ASW1(config)#do sh span

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     0022.bd89.2180
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/8               Desg FWD 19        128.8    P2p 


ASW1(config)#
*Mar  1 02:26:22.528: STP: VLAN0001 heard root     1-0026.ca6b.e980 on Fa0/8
*Mar  1 02:26:22.528:     supersedes 32769-0022.bd89.2180
*Mar  1 02:26:22.528: STP: VLAN0001 new root is 1, 0026.ca6b.e980 on port Fa0/8, cost 19
ASW1(config)#do sh span

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             Cost        19
             Port        8 (FastEthernet0/8)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/8               Root FWD 19        128.8    P2p 


ASW1(config)#do sh span

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             Cost        19
             Port        8 (FastEthernet0/8)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0022.bd89.2180
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 
Fa0/2               Desg FWD 19        128.2    P2p 
Fa0/8               Root FWD 19        128.8    P2p 


ASW1(config)#
ASW2#debug spanning-tree events 
Spanning Tree event debugging is on
ASW2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
ASW2(config)#spa
ASW2(config)#spanning-tree vla
ASW2(config)#spanning-tree vlan 1 pri
ASW2(config)#spanning-tree vlan 1 priority 0
ASW2(config)#
*Mar  1 01:52:03.074: setting bridge id (which=1) prio 1 prio cfg 0 sysid 1 (on) id 0001.0026.ca6b.e980
ASW2(config)#^Z
ASW2#sh spa
ASW2#sh spanning-tree 
*Mar  1 01:52:18.249: %SYS-5-CONFIG_I: Configured from console by console
ASW2#sh spanning-tree vlan 1

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    1      (priority 0 sys-id-ext 1)
             Address     0026.ca6b.e980
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 


ASW2#
*Mar  1 01:54:48.489: STP: VLAN0001 Topology Change rcvd on Fa0/1
ASW2#
*Mar  1 01:56:39.219: STP: VLAN0001 Topology Change rcvd on Fa0/1
ASW2#
ASW2#sh span
ASW2#sh spanning-tree 

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    1      (priority 0 sys-id-ext 1)
             Address     0026.ca6b.e980
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 


ASW2#
*Mar  1 02:07:15.294: STP: VLAN0001 heard root 32769-0022.bd89.2180 on Fa0/1
ASW2#
*Mar  1 02:08:54.044: STP: VLAN0001 we are the spanning tree root
*Mar  1 02:08:54.044: STP[1]: Generating TC trap for port FastEthernet0/1
*Mar  1 02:08:55.051: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
ASW2#
*Mar  1 02:08:56.049: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down
ASW2#conf t                 
Enter configuration commands, one per line.  End with CNTL/Z.
ASW2(config)#no spanning-tree vlan 1 priority 0
ASW2(config)#do sh spa
ASW2(config)#do sh spanning-tree 

No spanning tree instance exists.

ASW2(config)#spanning-tree vlan 1              
ASW2(config)#do sh spanning-tree 

No spanning tree instance exists.

ASW2(config)#do sh spanning-tree 

No spanning tree instance exists.

ASW2(config)#do sh spanning-tree 

No spanning tree instance exists.

ASW2(config)#do sh spanning-tree 

No spanning tree instance exists.

ASW2(config)#
*Mar  1 02:16:01.653: setting bridge id (which=3) prio 32769 prio cfg 32768 sysid 1 (on) id 8001.0026.ca6b.e980
*Mar  1 02:16:01.653: set portid: VLAN0001 Fa0/1: new port id 8001
*Mar  1 02:16:01.653: STP: VLAN0001 Fa0/1 -> listening
ASW2(config)#
*Mar  1 02:16:03.088: STP: VLAN0001 heard root 32769-0022.bd89.2180 on Fa0/1
*Mar  1 02:16:03.088:     supersedes 32769-0026.ca6b.e980
*Mar  1 02:16:03.088: STP: VLAN0001 new root is 32769, 0022.bd89.2180 on port Fa0/1, cost 19
ASW2(config)#
*Mar  1 02:16:03.658: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
*Mar  1 02:16:04.665: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
ASW2(config)#do sh spanning-tree 

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     0022.bd89.2180
             Cost        19
             Port        1 (FastEthernet0/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0026.ca6b.e980
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Root LIS 19        128.1    P2p 


ASW2(config)#
*Mar  1 02:16:16.661: STP: VLAN0001 Fa0/1 -> learning
ASW2(config)#
*Mar  1 02:16:31.668: STP[1]: Generating TC trap for port FastEthernet0/1
*Mar  1 02:16:31.668: STP: VLAN0001 Fa0/1 -> forwarding
ASW2(config)#sh spa
ASW2(config)#^Z    
ASW2#sh 
*Mar  1 02:16:41.491: %SYS-5-CONFIG_I: Configured from console by console
ASW2#conf t
*Mar  1 02:16:43.144: STP: VLAN0001 heard root 32769-0022.bd89.2180 on Fa0/1
*Mar  1 02:16:43.144:     supersedes 32769-0026.ca6b.e980
*Mar  1 02:16:43.144: STP: VLAN0001 new root is 32769, 0022.bd89.2180 on port Fa0/1, cost 19
*Mar  1 02:16:43.144: STP: VLAN0001 sent Topology Change Notice on Fa0/1
ASW2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
ASW2(config)#do sh spa
ASW2(config)#do sh spanning-tree vlan 1

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     0022.bd89.2180
             Cost        19
             Port        1 (FastEthernet0/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0026.ca6b.e980
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Root FWD 19        128.1    P2p 


ASW2(config)#do sh spanning-tree int f0/1 detail
 Port 1 (FastEthernet0/1) of VLAN0001 is root forwarding 
   Port path cost 19, Port priority 128, Port Identifier 128.1.
   Designated root has priority 32769, address 0022.bd89.2180
   Designated bridge has priority 32769, address 0022.bd89.2180
   Designated port id is 128.8, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default
   BPDU: sent 2, received 23
ASW2(config)#do sh spanning-tree int f0/1 detail
 Port 1 (FastEthernet0/1) of VLAN0001 is root forwarding 
   Port path cost 19, Port priority 128, Port Identifier 128.1.
   Designated root has priority 32769, address 0022.bd89.2180
   Designated bridge has priority 32769, address 0022.bd89.2180
   Designated port id is 128.8, designated path cost 0
   Timers: message age 2, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default
   BPDU: sent 2, received 24
ASW2(config)#do sh spanning-tree int f0/1 detail
 Port 1 (FastEthernet0/1) of VLAN0001 is root forwarding 
   Port path cost 19, Port priority 128, Port Identifier 128.1.
   Designated root has priority 32769, address 0022.bd89.2180
   Designated bridge has priority 32769, address 0022.bd89.2180
   Designated port id is 128.8, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default
   BPDU: sent 2, received 25
ASW2(config)#do sh spanning-tree int f0/1 detail
 Port 1 (FastEthernet0/1) of VLAN0001 is root forwarding 
   Port path cost 19, Port priority 128, Port Identifier 128.1.
   Designated root has priority 32769, address 0022.bd89.2180
   Designated bridge has priority 32769, address 0022.bd89.2180
   Designated port id is 128.8, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default
   BPDU: sent 2, received 26
ASW2(config)#do sh spanning-tree int f0/1 detail
 Port 1 (FastEthernet0/1) of VLAN0001 is root forwarding 
   Port path cost 19, Port priority 128, Port Identifier 128.1.
   Designated root has priority 32769, address 0022.bd89.2180
   Designated bridge has priority 32769, address 0022.bd89.2180
   Designated port id is 128.8, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default
   BPDU: sent 2, received 41
ASW2(config)#no spanning-tree vlan 1            
ASW2(config)#
*Mar  1 02:23:05.068: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
ASW2(config)#
*Mar  1 02:23:06.067: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down
ASW2(config)#
*Mar  1 02:23:11.788: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
*Mar  1 02:23:12.794: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
ASW2(config)#do sh span

No spanning tree instance exists.

ASW2(config)#do sh span

No spanning tree instance exists.

ASW2(config)#spa                    
ASW2(config)#spanning-tree vla
ASW2(config)#spanning-tree vlan 1
ASW2(config)#
*Mar  1 02:24:41.437: setting bridge id (which=3) prio 32769 prio cfg 32768 sysid 1 (on) id 8001.0026.ca6b.e980
*Mar  1 02:24:41.437: set portid: VLAN0001 Fa0/1: new port id 8001
*Mar  1 02:24:41.437: STP: VLAN0001 Fa0/1 -> listening
ASW2(config)#
*Mar  1 02:24:43.458: STP: VLAN0001 heard root 32769-0022.bd89.2180 on Fa0/1
*Mar  1 02:24:43.458:     supersedes 32769-0026.ca6b.e980
*Mar  1 02:24:43.458: STP: VLAN0001 new root is 32769, 0022.bd89.2180 on port Fa0/1, cost 19
ASW2(config)#
*Mar  1 02:24:56.444: STP: VLAN0001 Fa0/1 -> learning
ASW2(config)#
*Mar  1 02:25:11.451: STP[1]: Generating TC trap for port FastEthernet0/1
*Mar  1 02:25:11.451: STP: VLAN0001 Fa0/1 -> forwarding
ASW2(config)#spa
ASW2(config)#spanning-tree vlan 1 pri
ASW2(config)#spanning-tree vlan 1 priority 0
ASW2(config)#
*Mar  1 02:26:04.727: setting bridge id (which=1) prio 1 prio cfg 0 sysid 1 (on) id 0001.0026.ca6b.e980
ASW2(config)#do sh span                     

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    1
             Address     0026.ca6b.e980
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    1      (priority 0 sys-id-ext 1)
             Address     0026.ca6b.e980
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1               Desg FWD 19        128.1    P2p 


ASW2(config)#

References

tech/network/cisco/stp/bpdufilter/bpdufilter.txt · Last modified: 2019/06/08 11:17 by wnoguchi