Cisco Nexus 5500 Series Command Reference Manual page 174

spanning-tree bpduguard
spanning-tree bpduguard
To enable bridge protocol data unit (BPDU) Guard on an interface, use the spanning-tree bpduguard
command. To return to the default settings, use the no form of this command.
Syntax Description
enable
disable
Command Default The setting that is already configured when you enter the spanning-tree port type edge bpdufilter
default command.
Command Modes Interface configuration mode
Command History Release
5.2(1)N1(1)
Usage Guidelines BPDU Guard prevents a port from receiving BPDUs. If the port still receives a BPDU, it is put in the
error-disabled state as a protective measure.
Be careful when using this command. You should use this command only with interfaces that connect to
Caution
end stations; otherwise, an accidental topology loop could cause a data-packet loop and disrupt the
switch and network operation.
When you enable this BPDU Guard command globally, the command applies only to spanning tree edge
ports. See the spanning-tree port type edge bpdufilter default command for more information on the
global command for BPDU Guard. However, when you enable this feature on an interface, it applies to
that interface regardless of the spanning tree port type.
This command has three states:
•
•
•
Typically, this feature is used in a service-provider environment where the network administrator wants
to prevent an access port from participating in the spanning tree.
Cisco Nexus 5500 Series NX-OS Layer 2 Interfaces Command Reference
1168
spanning-tree bpduguard {enable | disable}
no spanning-tree bpduguard
Enables BPDU Guard on this interface.
Disables BPDU Guard on this interface.
Modification
This command was introduced.
spanning-tree bpduguard enable—Unconditionally enables BPDU Guard on the interface.
spanning-tree bpduguard disable—Unconditionally disables BPDU Guard on the interface.
no spanning-tree bpduguard—Enables BPDU Guard on the interface if it is an operational
spanning tree edge port and if the spanning-tree port type edge bpdufilter default command is
configured.
Chapter S Commands
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