Cisco Systems EA6500 Manual De Usuario

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#

UplinkFast increases the bridge priority to 49152 and adds 3000 to the STP port cost of all Layer 2 LAN 
interfaces on the Catalyst 6500 series switch, decreasing the probability that the switch will become the 
root bridge. The max_update_rate value represents the number of multicast packets transmitted per 
second (the default is 150 packets per second). 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.

When you enable UplinkFast, it affects all VLANs on the Catalyst 6500 series switch. You cannot 
configure UplinkFast on an individual VLAN.

To enable UplinkFast, perform this task: 

This example shows how to enable UplinkFast with an update rate of 400 packets per second:

Router# configure terminal 

Router(config)# spanning-tree uplinkfast max-update-rate 400 

Router(config)# exit 

Router#

Router(config)# spanning-tree uplinkfast 

[max-update-rate max_update_rate] 

Enables UplinkFast.

Router(config)# no spanning-tree uplinkfast 

 

Reverts to the default rate.

Router(config)# no spanning-tree uplinkfast 

Disables UplinkFast.

Router(config)# end 

Exits configuration mode.

Router# show spanning-tree vlan vlan_ID 

Verifies that UplinkFast is enabled.