Enabling Uplinkfast - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Enabling UplinkFast

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
Portfast
PortFast BPDU Guard
Portfast BPDU Filter is enabled by default
Loopguard
UplinkFast
BackboneFast
Pathcost method used is long
Name
---------------------- -------- --------- -------- ---------- ----------
2 vlans
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 Catalyst 6500 series switch, decreasing the probability that the switch 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.
When you enable UplinkFast, it affects all VLANs on the Catalyst 6500 series switch. You cannot
Note
configure UplinkFast on an individual VLAN.
To enable UplinkFast, perform this task:
Command
Step 1
Router(config)# spanning-tree uplinkfast
Router(config)# spanning-tree uplinkfast
[max-update-rate max_update_rate]
Router(config)# no spanning-tree uplinkfast
max-update-rate
Router(config)# no spanning-tree uplinkfast
Step 2
Router(config)# end
Step 3
Router# show spanning-tree vlan vlan_ID
This example shows how to enable UplinkFast:
Router# configure terminal
Router(config)# spanning-tree uplinkfast
Router(config)# exit
Router#
This example shows how to enable UplinkFast with an update rate of 400 packets per second:
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
18-12
is disabled
is enabled by default
is disabled by default
is disabled by default
is disabled
is disabled
Blocking Listening Learning Forwarding STP Active
0 0
Purpose
Enables UplinkFast.
Enables UplinkFast with an update rate in seconds.
Reverts to the default rate.
Disables UplinkFast.
Exits configuration mode.
Verifies that UplinkFast is enabled.
Chapter 18 Configuring Optional STP Features
0 3 3
OL-11439-03