Administrator Guide

Name PortID Prio Cost Sts Cost Bridge ID PortID
---------------------------------------------------------
Gi 1/1 128.1223 128 20000 EDS 0 32768 0001.e800.a12b 128.1223
Example (Guard)
Dell# show spanning-tree pvst vlan 5 guard
Interface
Name Instance Sts Guard type
-----------------------------------
Gi 1/1 5 INCON(Root) Rootguard
Gi 1/2 5 FWD Loopguard
Gi 1/3 5 EDS(Shut) Bpduguard
Related Commands
• spanning-tree pvst — congure PVST+ on an interface.
spanning-tree pvst
Congure a PVST+ interface with one of these settings: edge port with optional bridge port data unit (BPDU) guard, port disablement if an
error condition occurs, port priority or cost for a VLAN range, loop guard, or root guard.
S3048
Syntax
spanning-tree pvst {edge-port [bpduguard [shutdown-on-violation]] | err-disable
| vlan vlan-range {cost number | priority value} | loopguard | rootguard}
Parameters
edge-port Enter the keywords edge-port to congure the interface as a PVST+ edge port.
bpduguard
Enter the keyword portfast to enable Portfast to move the interface into Forwarding
mode immediately after the root fails.
Enter the keyword bpduguard to disable the port when it receives a BPDU.
shutdown-on-
violation
(OPTIONAL) Enter the keywords shutdown-on-violation to hardware disable an
interface when a BPDU is received and the port is disabled.
err-disable Enter the keywords err-disable to enable the port to be put into the error-disable
state (EDS) if an error condition occurs.
vlan vlan-range Enter the keyword vlan then the VLAN numbers. The range is from 1 to 4094.
cost number Enter the keyword cost then the port cost value. The range is from 1 to 200000.
Defaults:
• 100 Mb/s Ethernet interface = 200000.
• 1-Gigabit Ethernet interface = 20000.
• 10-Gigabit Ethernet interface = 2000.
• Port Channel interface with one 100 Mb/s Ethernet = 200000.
• Port Channel interface with one 1 Gigabit Ethernet = 20000.
• Port Channel interface with one 10 Gigabit Ethernet = 2000.
• Port Channel with two 1 Gigabit Ethernet = 18000.
• Port Channel with two 10 Gigabit Ethernet = 1800.
1248 Per-VLAN Spanning Tree Plus (PVST+)