Cisco WS-C6506 User Manual

9-19
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 9 Configuring Spanning-Tree PortFast, UplinkFast, BackboneFast, and Loop Guard
Configuring Loop Guard on the Switch
Vlan Blocking Listening Learning Forwarding STP Active
----- -------- --------- -------- ---------- ----------
1 0 0 0 1 1
Blocking Listening Learning Forwarding STP Active
----- -------- --------- -------- ---------- ----------
Total 0 0 0 1 1
BackboneFast statistics
-----------------------
Number of inferior BPDUs received (all VLANs) : 0
Number of RLQ req PDUs received (all VLANs) : 0
Number of RLQ res PDUs received (all VLANs) : 0
Number of RLQ req PDUs transmitted (all VLANs) : 0
Number of RLQ res PDUs transmitted (all VLANs) : 0
Console> (enable)
Disabling BackboneFast
To disable BackboneFast on the switch, perform this task in privileged mode:
This example shows how to disable BackboneFast on the switch and verify the configuration:
Console> (enable) set spantree backbonefast disable
Backbonefast enabled for all VLANs
Console> (enable) show spantree backbonefast
Backbonefast is disable.
Console> (enable)
Configuring Loop Guard on the Switch
These sections describe how to configure BackboneFast:
• Enabling Loop Guard, page 9-19
• Disabling Loop Guard, page 9-20
Enabling Loop Guard
Use the set spantree guard command to enable or disable the spanning-tree loop guard on a per-port
basis.
To enable loop guard on the switch, perform this task in privileged mode:
Task Command
Step 1
Disable BackboneFast on the switch. set spantree backbonefast disable
Step 2
Verify that BackboneFast is disabled. show spantree backbonefast
Task Command
Step 1
Enable loop guard on a port. set spantree guard loop mod/port
Step 2
Verify that loop guard is enabled. show spantree guard {mod/port | vlan} mistp-instance
instance

Cisco WS-C6506 Specifications

General

Brand	Cisco
Model	WS-C6506
Category	Switch
Language	English