Reference Guide

Multiple Spanning Tree Protocol (MSTP) | 609
View the current values for these interface parameters using the command show config from INTERFACE
mode. See Figure 30-8.
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 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:
Verify that EdgePort is enabled on a port using the command
show config from the INTERFACE mode, as
shown in Figure 30-8.
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 mstp edge-port
[bpduguard |
shutdown-on-violation
]
INTERFACE
FTOS Behavior: Regarding bpduguard shutdown-on-violation behavior:
1 If the interface to be shutdown is a port channel then all the member ports are disabled in the hardware.
2 When a physical port is added to a port channel already in error disable state, the new member port will also be disabled
in the hardware.
3 When a physical port is removed from a port channel in error disable state, the error disabled state is cleared on this
physical port (the physical port will be enabled in the hardware).
4 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 ( no spanning-tree stp-id portfast [bpduguard |
[shutdown-on-violation]] ).
•Disable spanning tree on the interface (
no spanning-tree in INTERFACE mode).
•Disabling global spanning tree (
no spanning-tree in CONFIGURATION mode).