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 82
Cross-Stack UplinkFast, on page 83
How Cross-Stack UplinkFast Works, on page 84
Events That Cause Fast Convergence, on page 86
Disabling UplinkFast
This procedure is optional.
Beginning in privileged EXEC mode, follow these steps to disable UplinkFast and Cross-Stack UplinkFast
(CSUF).
Before You Begin
UplinkFast must be enabled.
SUMMARY STEPS
1.
configure terminal
2.
no spanning-tree uplinkfast
3.
end
DETAILED STEPS
PurposeCommand or Action
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
96 OL-29424-01
Configuring Optional Spanning-Tree Features
Disabling UplinkFast
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