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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
implement only 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 mstp edge-port [bpduguard | shutdown-on-violation]
Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation 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 the Error Disable state, the new member
port is also disabled in the hardware.
•
When you remove a physical port from a port channel in the 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 disabled in the hardware.
•
You can clear the Error Disabled state with any of the following methods:
•
Use the shutdown command on the interface.
•
Disable the shutdown-on-violation command on the interface (using the no spanning-
tree stp-id portfast [bpduguard | [shutdown-on-violation]] command).
•
Disable spanning tree on the interface (using the no spanning-tree command in INTERFACE
mode).
•
Disabling global spanning tree (using the no spanning-tree command in CONFIGURATION
mode).
Example of Enabling an EdgePort on an Interface
To verify that EdgePort is enabled, use the show config command from INTERFACE mode.
Dell(conf-if-te-3/41)#spanning-tree mstp edge-port
Dell(conf-if-te-3/41)#show config
!
interface TengigabitEthernet 3/41
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
Multiple Spanning Tree Protocol (MSTP)
712
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Troubleshooting
