Dell S4048T, Configuration Manual

Page: 900 / 1277

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 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 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. If you enable EdgePort on
an interface connected to a network, it can cause loops.
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).
• You can clear the Error Disabled state with any of the following methods:
• Perform an
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).
• Disable global spanning tree (the
no spanning-tree
command in CONFIGURATION mode).
To enable EdgePort on an interface, use the following command.
• Enable EdgePort on an interface.
INTERFACE mode
spanning-tree rstp edge-port [bpduguard | shutdown-on-violation]
Example of Verifying an EdgePort is Enabled on an Interface
To verify that EdgePort is enabled on a port, use the
show spanning-tree rstp
command from EXEC
privilege mode or the
show config
command from INTERFACE mode.
NOTE: Dell Networking recommends using the
show config
command from INTERFACE mode.
In the following example, the bold line indicates that the interface is in EdgePort mode.
Dell(conf-if-te-2/1)#show config
!
interface TenGigabitEthernet 2/1
no ip address
switchport
spanning-tree rstp edge-port
shutdown
Dell(conf-if-te-2/1)#
Rapid Spanning Tree Protocol (RSTP) 900