Configuration manual

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).
– 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 mstp edge-port [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-gi-3/41)#spanning-tree mstp edge-port
Dell(conf-if-gi-3/41)#show config
!
interface GigabitEthernet 3/41
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
Dell(conf-if-gi-3/41)#
Flush MAC Addresses after a Topology Change
The Dell Networking OS has an optimized MAC address flush mechanism for RSTP, MSTP, and PVST+
that flushes addresses only when necessary, which allows for faster convergence during topology
changes.
However, you may activate the flushing mechanism defined by 802.1Q-2003 using the tc-flush-
standard command, which flushes MAC addresses after every topology change notification.
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Multiple Spanning Tree Protocol (MSTP)