Enabling Backbonefast - Cisco 7604 Configuration Manual

Chapter 21 Configuring Optional STP Features
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:
Router# configure terminal
Router(config)# spanning-tree uplinkfast
Router(config)# spanning-tree uplinkfast max-update-rate 400
Router(config)# exit
Router#
This example shows how to verify that UplinkFast is enabled:
Router# show spanning-tree uplinkfast
UplinkFast is enabled
Router#

Enabling BackboneFast

Note BackboneFast operates correctly only when enabled on all network devices in the network.
BackboneFast is not supported on Token Ring VLANs. This feature is supported for use with third-party
network devices.
To enable BackboneFast, perform this task:
Command
Step 1
Router(config)# spanning-tree backbonefast
Router(config)# no spanning-tree backbonefast
Step 2
Router(config)# end
Step 3
Router# show spanning-tree vlan vlan_ID
This example shows how to enable BackboneFast:
Router# configure terminal
OL-4266-08
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.
Purpose
Enables BackboneFast.
Disables BackboneFast.
Exits configuration mode.
Verifies that BackboneFast is enabled.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Enabling BackboneFast
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