Enabling Loop Guard Or Root Guard On Specified Interfaces; Configuring Fex Port Spanning Tree Bpdu Transmit Interval - Cisco Nexus 6000 Series Configuration Manual

Configuring STP Extensions
This example shows how to enable Loop Guard on all spanning tree normal or network ports:
switch# configure terminal
switch(config)# spanning-tree loopguard default

Enabling Loop Guard or Root Guard on Specified Interfaces

You can enable either Loop Guard or Root Guard on specified interfaces.
Enabling Root Guard on a port means that port cannot become a root port, and LoopGuard prevents alternate
or root ports from becoming the designated port because of a failure that could lead to a unidirectional link.
Both Loop Guard and Root Guard enabled on an interface apply to all VLANs to which that interface belongs.
Entering the Loop Guard command for the specified interface overrides the global Loop Guard command.
Note
Before You Begin
Ensure that STP is configured.
Ensure that you are configuring Loop Guard on spanning tree normal or network ports.
Procedure
Step 1
Step 2
Step 3
This example shows how to enable Root Guard on Ethernet port 1/4:
switch# configure terminal
switch (config)# interface ethernet 1/4
switch(config-if)# spanning-tree guard root

Configuring FEX Port Spanning Tree BPDU Transmit Interval

You can configure the number of seconds between generation of the config Bridge Protocol Data Units
(BPDUs) for FEX ports when they are connected to Cisco Nexus devices.
Command or Action
switch# configure terminal
switch(config)# interface type
slot/port
switch(config-if)# spanning-tree
guard {loop | root | none}
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
Purpose
Enters global configuration mode.
Specifies the interface to configure, and enters the interface
configuration mode.
If this is a 10G breakout port, the slot/port syntax is
Note
QSFP-module/port.
Enables or disables either Loop Guard or Root Guard for the
specified interface. By default, Root Guard is disabled by
default, and Loop Guard on specified ports is also disabled.
Loop Guard runs only on spanning tree normal and
Note
network interfaces.
Configuring STP Extensions
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