Cisco 7604 Software Configuration Guide - Page 328

Enabling BPDU Guard Chapter 21 Configuring Optional STP Features Enabling BPDU Guard To enable BPDU Guard globally, perform this task: Step 1 Step 2 Step 3 Command Router(config)# spanning-tree portfast bpduguard default Router(config)# no spanning-tree portfast bpduguard default Router(config)# end Router# show spanning-tree summary totals Purpose Enables BPDU Guard globally. Disables BPDU Guard globally. Exits configuration mode. Verifies the configuration. This example shows how to enable BPDU Guard: Router# configure terminal Router(config)# spanning-tree portfast bpduguard Router(config)# end Router# This example shows how to verify the configuration: Router# show spanning-tree summary totals default Root bridge for:VLAN0010 EtherChannel misconfiguration guard is enabled Extended system ID is disabled Portfast is enabled by default PortFast BPDU Guard is disabled by default Portfast BPDU Filter is enabled by default Loopguard is disabled by default UplinkFast is disabled BackboneFast is disabled Pathcost method used is long Name Blocking Listening Learning Forwarding STP Active 2 vlans 0 0 0 3 3 Router# Enabling UplinkFast UplinkFast increases the bridge priority to 49152 and adds 3000 to the STP port cost of all Layer 2 LAN interfaces on the Cisco 7600 series router, decreasing the probability that the router will become the root bridge. UplinkFast cannot be enabled on VLANs that have been configured for bridge priority. To enable UplinkFast on a VLAN with bridge priority configured, restore the bridge priority on the VLAN to the default value by entering a no spanning-tree vlan vlan_ID priority command in global configuration mode. Note When you enable UplinkFast, it affects all VLANs on the Cisco 7600 series router. You cannot configure UplinkFast on an individual VLAN. To enable UplinkFast, perform this task: 21-12 Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX OL-4266-08