PurposeCommand or Action
If you set the rate to 0, station-learning frames are not generated,
and the spanning-tree topology converges more slowly after a loss
of connectivity.
When you enter this command, CSUF also is enabled on all nonstack
port interfaces.
Returns to privileged EXEC mode.end
Example:
Switch(config)# end
Step 4
When UplinkFast is enabled, the switch priority of all VLANs is set to 49152. If you change the path cost to
a value less than 3000 and you enable UplinkFast or UplinkFast is already enabled, the path cost of all interfaces
and VLAN trunks is increased by 3000 (if you change the path cost to 3000 or above, the path cost is not
altered). The changes to the switch priority and the path cost reduce the chance that a switch will become the
root switch.
When UplinkFast is disabled, the switch priorities of all VLANs and path costs of all interfaces are set to
default values if you did not modify them from their defaults.
When you enable the UplinkFast feature using these instructions, CSUF is automatically globally enabled on
nonstack port interfaces.
Related Topics
UplinkFast, on page 290
Cross-Stack UplinkFast, on page 291
How Cross-Stack UplinkFast Works, on page 292
Events That Cause Fast Convergence, on page 294
Disabling UplinkFast
This procedure is optional.
Follow these steps to disable UplinkFast and Cross-Stack UplinkFast (CSUF).
Before You Begin
UplinkFast must be enabled.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
no spanning-tree uplinkfast
4.
end
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
308
How to Configure Optional Spanning-Tree Features
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