Enabling Bpdu Filtering On Specified Interfaces - Cisco nexus 5000 series Configuration Manual

Configuring STP Extensions
Be careful when using this command: using it incorrectly can cause bridging loops.
Caution
Note When enabled globally, BPDU Filtering is applied only on ports that are operational edge ports. Ports
send a few BPDUs at linkup before they effectively filter outbound BPDUs. If a BPDU is received on an
edge port, it immediately loses its operational edge port status and BPDU Filtering is disabled.
Before You Begin
Ensure that STP is configured.
Ensure that you have configured some spanning tree edge ports.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# spanning-tree port type edge bpdufilter default
DETAILED STEPS
Command or Action
Step 1 switch# configure terminal
Step 2 switch(config)# spanning-tree port type edge
bpdufilter default
This example shows how to enable BPDU Filtering on all operational spanning tree edge ports:
switch# configure terminal
switch(config)# spanning-tree port type edge bpdufilter default

Enabling BPDU Filtering on Specified Interfaces

You can apply BPDU Filtering to specified interfaces. When enabled on an interface, that interface does not
send any BPDUs and drops all BPDUs that it receives. This BPDU Filtering functionality applies to the entire
interface, whether trunking or not.
Caution Be careful when you enter the spanning-tree bpdufilter enable command on specified interfaces. Explicitly
configuring BPDU Filtering on a port that is not connected to a host can result in bridging loops because
the port ignores any BPDU it receives and goes to forwarding.
You can enter this command to override the port configuration on specified interfaces.
This command has three states:
OL-25842-01
Purpose
Enters global configuration mode.
Enables BPDU Filtering by default on all operational spanning
tree edge ports. Global BPDU Filtering is disabled by default.
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.1(3)N1(1)
Configuring STP Extensions
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