Cisco ME 3400 Command Reference Manual page 651
Ethernet access switch
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Also See for ME 3400:
- Software configuration manual (1138 pages) ,
- Command reference manual (872 pages) ,
- Hardware installation manual (88 pages)
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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
Loop guard is most effective when it is configured on the entire switched network. When the switch is
operating in PVST+ or rapid-PVST+ mode, loop guard prevents alternate and root ports from becoming
designated ports, and spanning tree does not send bridge protocol data units (BPDUs) on root or alternate
ports. When the switch is operating in MST mode, BPDUs are not sent on nonboundary interfaces if the
interface is blocked by loop guard in all MST instances. On a boundary interface, loop guard blocks the
interface in all MST instances.
To disable root guard or loop guard, use the spanning-tree guard none interface configuration
command on an STP interface. You cannot enable both root guard and loop guard at the same time.
You can override the setting of the spanning-tree loopguard default global configuration command by
using the spanning-tree guard loop interface configuration command on an STP interface.
Examples
This example shows how to enable root guard on all the VLANs associated with the specified port:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree guard root
This example shows how to enable loop guard on all the VLANs associated with the specified port:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree guard loop
You can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
Command
show running-config
spanning-tree cost
spanning-tree loopguard default
spanning-tree mst cost
spanning-tree mst port-priority
spanning-tree mst root
spanning-tree port-priority
spanning-tree vlan
OL-9640-10
Description
Displays the operating configuration.
Sets the path cost for spanning-tree calculations.
Prevents alternate or root ports from becoming designated
ports because of a failure that leads to a unidirectional link.
Configures the path cost for MST calculations.
Configures an STP MST port priority.
Configures the MST root switch priority and timers based on
the network diameter.
Configures an STP port priority.
priority
Sets the switch priority for the specified spanning-tree
instance.
Cisco ME 3400 Ethernet Access Switch Command Reference
spanning-tree guard
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