Specifications

show spanning-tree
233
Root Cost:19
Root Port:0/20
Max Age:20 Hello Time:2
Forward Delay:15
Port Information
Port:0/17 Down
Status:Disabled Role:-
Priority:128 Cost:-
Link Type:- Compatible Mode:-
Loop Guard:ON(Blocking) PortFast:OFF
BPDUFilter:OFF RootGuard:OFF
Port:0/20 Up
Status:Forwarding Role:Root
Priority:128 Cost:19
Link Type:- Compatible Mode:-
Loop Guard:OFF PortFast:ON(BPDU received)
BPDUFilter:OFF RootGuard:OFF
BPDU Parameters(2008/11/14 11:26:47):
Designated Root
Priority:36862 MAC address:0012.e2c4.2772
Designated Bridge
Priority:36862 MAC address:0012.e2c4.2772
Root Cost:0
Port ID
Priority:128 Number:20
Message Age Timer:2(0)/20
>
Display items in Example 4
Item Meaning Displayed information
VLAN VLAN ID ID of the VLAN on which PVST+ Spanning Tree
Protocol is operating.
(Disabled) is displayed if the VLAN is not running.
PVST+ Spanning
Tree:
Operating status of the
protocol (PVST+ Spanning
Tree)
Enabled: The Spanning Tree Protocol is running.
Disabled: The Spanning Tree Protocol is not running.
Mode Configured protocol type PVST+:
The protocol type is set to PVST+ mode.
Rapid PVST+:
The protocol type is set to Rapid PVST+ mode.
Bridge ID Bridge ID on the Switch --
Priority Bridge priority 0 to 65535
The lower the value, the higher the priority.
MAC Address MAC address MAC address of the Switch
Bridge Status Status of the Switch Root: Root bridge
Designated: Designated bridge
Path Cost Method Path cost length mode Long: 32-bit values are used for the path cost value.
Short: 16-bit values are used for the path cost value.
Max Age Maximum valid time of Maximum valid time of BPDUs sent from the Switch