Disabling Uplinkfast - Cisco WS-C2948G-GE-TX Configuration Manual

Configuring UplinkFast
This example shows how to display the UplinkFast feature settings for all VLANs:
Console> show spantree uplinkfast
Station update rate set to 15 packets/100ms.
uplinkfast all-protocols field set to off.
VLAN port list
------------------------------------------------
1-20
21-50
51-100 2/1(fwd), 2/12
Console>

Disabling UplinkFast

To disable UplinkFast and restore the default spanning tree bridge priority, port cost, and port-VLAN
cost values to their default values, enter the clear spantree uplinkfast command.
Caution Use caution when entering the clear spantree uplinkfast command. This command restores the
port-VLAN costs on all ports to the default minus one (18) and the port cost to the default value (19). If
you have configured per-VLAN load sharing on redundant trunk links, the load-sharing configuration
can be affected by this command.
You can disable only spanning tree UplinkFast processing on the switch using the set spantree
uplinkfast disable command. This command does not affect the bridge priority, port cost, and
port-VLAN cost values on the switch.
When you disable UplinkFast, it affects all VLANs on the switch. You cannot disable UplinkFast on a
Note
per-VLAN basis.
To disable UplinkFast on a switch, perform this task in privileged mode:
Task
Step 1
(Optional) Disable UplinkFast processing on the switch and
restore the default bridge priority, port cost, and port-VLAN
cost values.
Step 2
(Optional) Disable UplinkFast processing on the switch
without affecting the bridge priority, port cost, and
port-VLAN cost values.
Step 3
Verify that UplinkFast is enabled.
This example shows how to disable UplinkFast on the switch and restore the default bridge priority, port
cost, and port-VLAN cost values:
Console> (enable) clear spantree uplinkfast
This command will cause all portcosts, portvlancosts, and the
bridge priority on all vlans to be set to default.
Do you want to continue (y/n) [n]? y
VLANs 1-1005 bridge priority set to 32768.
The port cost of all bridge ports set to default value.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
8-16
Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard
1/1(fwd),1/2-1/5
1/9(fwd), 1/6-1/8, 1/10-1/12
Command
clear spantree uplinkfast
set spantree uplinkfast disable
show spantree uplinkfast
78-15908-01