778 | Rapid Spanning Tree Protocol (RSTP)
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Figure 38-7. EdgePort Enabled on Interface
Influence RSTP Root Selection
The Rapid Spanning Tree Protocol determines the root bridge, but you can assign one bridge a lower
priority to increase the likelihood that it will be selected as the root bridge.
To change the bridge priority, use the following command:
A console message appears when a new root bridge has been assigned. Figure 38-8 shows the console
message after the
bridge-priority command is used to make R2 the root bridge.
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).
Task Command Syntax Command Mode
Assign a number as the bridge priority or designate it as the
primary or secondary root.
priority-value range: 0 to 65535. The lower the number
assigned, the more likely this bridge will become the root
bridge. The default is 32768. Entries must be multiples of
4096.
bridge-priority priority-value PROTOCOL
SPANNING TREE
RSTP
FTOS(conf-if-gi-2/0)#show config
!
interface GigabitEthernet 2/0
no ip address
switchport
spanning-tree rstp edge-port
shutdown
FTOS(conf-if-gi-2/0)#
Indicates the interface is in EdgePort mode
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