Reference Guide

790 | Per-VLAN Spanning Tree Plus
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To change the port cost or priority of an interface:
The values for interface PVST+ parameters are given in the output of the command
show spanning-tree
pvst, as shown in the example in Influence PVST+ Root Selection.
Configure 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:
Note: The FTOS implementation of PVST+ uses IEEE 802.1s costs as the default costs. Other
implementations use IEEE 802.1d costs as the default costs if you are using Dell Force10 systems in a
multi-vendor network, verify that the costs are values you intended.
Task Command Syntax Command Mode
Change the port cost of an interface.
Range: 0 to 200000
Default: Refer to Table 43-2, "PVST+ Default Port Cost
Values," in Per-VLAN Spanning Tree Plus.
spanning-tree pvst vlan cost
INTERFACE
Change the port priority of an interface.
Range: 0 to 240, in increments of 16
Default: 128
spanning-tree pvst vlan priority
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