Reference Guide

Per-VLAN Spanning Tree Plus (PVST+) | 713
The values for interface PVST+ parameters are given in the output of the command show spanning-tree
pvst, as shown in Figure 39-4.
Configuring an EdgePort
The EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner. In
this mode an interface forwards frames by default until it receives a BPDU that indicates that it should
behave otherwise; it does not go through the Learning and Listening states. The
bpduguard
shutdown-on-violation option causes the interface hardware to be shutdown when it receives a BPDU.
When only
bpduguard is implemented, although the interface is placed in an Error Disabled state when
receiving the BPDU, the physical interface remains up and spanning-tree will drop
packets in the hardware
after a BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. This
feature is the same as PortFast mode in Spanning Tree.
To enable EdgePort on an interface, use the following command:
The EdgePort status of each interface is given in the output of the command
show spanning-tree pvst, as
shown in Figure 39-4.
Change the port priority of an interface.
VLAN range: 1 to 4094.
Priority range: 0 to 240, in increments of 16.
Default: 128
spanning-tree pvst vlan vlan-range
priority value
INTERFACE
Caution: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if it is enabled
on an interface connected to a network.
Task Command Syntax Command Mode
Enable EdgePort on an interface. spanning-tree pvst edge-port
[
bpduguard |
shutdown-on-violation]
INTERFACE
Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:
1 If the interface to be shutdown is a port channel then all the member ports are disabled in the hardware.
2 When a physical port is added to a port channel already in error disable state, the new member port will also be disabled
in the hardware.
3 When a physical port is removed from a port channel in error disable state, the error disabled state is cleared on this
physical port (the physical port will be enabled in the hardware).
The error disabled state can be cleared with any of the following methods:
• Perform a shutdown command on the interface.
• Disable the
shutdown-on-violation command on the interface ( no spanning-tree stp-id portfast [bpduguard |
[shutdown-on-violation]] ).
• Disable spanning tree on the interface (
no spanning-tree in INTERFACE mode).
• Disabling global spanning tree (
no spanning-tree in CONFIGURATION mode).
Task Command Syntax Command Mode