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Multiple Spanning Tree Protocol | 651
Configure 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 MSTP-enabled 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 29-8.
Figure 29-8. Configuring EdgePort
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 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.
The error disabled state can be cleared 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).
FTOS(conf-if-gi-3/41)#spanning-tree mstp edge-port
FTOS(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