Dell S4820T, Configuration Manual

Page: 784 / 1178

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]
The EdgePort status of each interface is given in the output of the
show spanning-tree pvst
command, as previously shown.
Dell Networking OS Behavior : Regarding the
bpduguard shutdown-on-violation
command
behavior:
• If the interface to be shut down is a port channel, all the member ports are disabled in the hardware.
• When you add a physical port to a port channel already in an Error Disable state, the new member
port is also disabled in the hardware.
• When you remove a physical port from a port channel in an Error Disable state, the Error Disabled
state is cleared on this physical port (the physical port is enabled in the hardware).
• The
reset linecard
command does not clear the Error Disabled state of the port or the hardware
Disabled state. The interface continues to be disables in the hardware.
• You can clear the Error Disabled state with any of the following methods:
– Perform a
shutdown
command on the interface.
– Disable the
shutdown-on-violation
command on the interface (the
no spanning-tree
stp-id portfast [bpduguard | [shutdown-on-violation]]
command).
– Disable spanning tree on the interface (the
no spanning-tree
command in INTERFACE mode).
– Disabling global spanning tree (the
no spanning-tree
command in CONFIGURATION mode).
784
Per-VLAN Spanning Tree Plus (PVST+)