Filter
Top Products
Port Cost Default Value
Port Channel with two 40-Gigabit Ethernet
interfaces
600
NOTE: The Dell Networking OS implementation of PVST+ uses IEEE 802.1s costs as the default
costs. Other implementations use IEEE 802.1w costs as the default costs. If you are using Dell
Networking systems in a multi-vendor network, verify that the costs are values you intended.
To change the port cost or port priority of an interface, use the following commands.
• Change the port cost of an interface.
INTERFACE mode
spanning-tree pvst vlan cost.
The range is from 0 to 200000.
Refer to the table for the default values.
• Change the port priority of an interface.
INTERFACE mode
spanning-tree pvst vlan priority.
The range is from 0 to 240, in increments of 16.
The default is 128.
The values for interface PVST+ parameters are given in the output of the show spanning-tree pvst
command, as previously shown.
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 shut down when it receives a BPDU. When
you only implement bpduguard, although the interface is placed in an Error Disabled state when
receiving the BPDU, the physical interface remains up and spanning-tree drops 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.
CAUTION: Configure EdgePort only on links connecting to an end station. EdgePort can cause
loops if you enable it on an interface connected to a network.
To enable EdgePort on an interface, use the following command.
• Enable EdgePort on an interface.
INTERFACE mode
spanning-tree pvst edge-port [bpduguard | shutdown-on-violation]
Per-VLAN Spanning Tree Plus (PVST+)
713