Displaying RSTP (IEEE 802.1w) Information

To show a summary of RSTP (IEEE 802.1w) information, enter the show 802-1w command.

device# show 802-1w  
--- VLAN 1 [ STP Instance owned by VLAN 1 ] ----------------------------
VLAN 1 BPDU cam_index is 2 and the IGC and DMA master Are(HEX) 0 1 2 3
Bridge IEEE 802.1W Parameters:
Bridge            Bridge  Bridge Bridge Force   tx
Identifier        MaxAge  Hello  FwdDly Version Hold
hex               sec     sec    sec            cnt
800000e080541700  20      2      15     Default 3
RootBridge        RootPath   DesignatedBri-    Root  Max  Fwd  Hel
Identifier        Cost       dge Identifier    Port  Age  Dly  lo
hex                          hex                     sec  sec  sec
800000e0804c9c00  200000     800000e0804c9c00  1     20   15   2
Port IEEE 802.1W Parameters:
      <--- Config Params -->|<-------------- Current state ----------------->
Port  Pri PortPath P2P Edge Role       State      Designa- Designated
Num       Cost     Mac Port                       ted cost bridge
1/1/1 128 200000   F   F    ROOT       FORWARDING 0        800000e0804c9c00
1/1/2 128 200000   F   F    DESIGNATED FORWARDING 200000   800000e080541700
1/1/3 128 200000   F   F    DESIGNATED FORWARDING 200000   800000e080541700
1/1/4 128 200000   F   F    BACKUP     DISCARDING 200000   800000e080541700

To display detailed information about RSTP (IEEE 802.1w), enter the show 802-1w detail command.

device# show 802-1w detail 
======================================================================
VLAN 1 - SPANNING TREE (IEEE 802.1W) ACTIVE
======================================================================
BridgeId 800000a0c9c002a0, forceVersion 2, txHoldCount 3

Number of topology changes: 53
Last topology change occured 13 minute(s) 30 second(s)  ago on lg40
Port 1/1/1 - Role: DESIGNATED - State: FORWARDING
  PathCost 20000, Priority 128, AdminOperEdge F, AdminPt2PtMac F
  DesignatedPriority - Root: 0x800000a0c9c002a0, Bridge: 0x800000a0c9c002a0 
  ActiveTimers - helloWhen 0 
  MachineStates - PIM: CURRENT, PRT: DESIGNATED_PORT, PST: FORWARDING
                  TCM: ACTIVE, PPM: SENDING_RSTP, PTX: TRANSMIT_IDLE
  Received - RST BPDUs 0, Config BPDUs 0, TCN BPDUs 0