9-13
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
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Chapter 9 Configuring Spanning Tree PortFast, UplinkFast, BackboneFast, and Loop Guard
Configuring UplinkFast
1003 0 0 0 0 0
1005 0 0 0 0 0
Blocking Listening Learning Forwarding STP Active
----- -------- --------- -------- ---------- ----------
Total 0 0 0 85 85
Console> (enable)
Configuring UplinkFast
You can configure UplinkFast for PVST+ or for Multi-Instance Spanning Tree Protocol (MISTP). The
command is the same but the output may be slightly different.
Note
For additional MISTP information, see
Chapter 8, “Configuring Spanning Tree.”
These sections describe how to configure UplinkFast on the switch:
•
Enabling UplinkFast, page 9-13
•
Disabling UplinkFast, page 9-14
Enabling UplinkFast
The
set spantree uplinkfast enable
command increases the path cost of all ports on the switch, making
it unlikely that the switch will become the root switch. The
station_update_rate
value represents the
number of multicast packets transmitted per 100 milliseconds (the default is 15 packets per millisecond).
Note
When you enable the
set spantree uplinkfast
command, it affects all VLANs on the switch. You
cannot configure UplinkFast on an individual VLAN.
To enable UplinkFast on the switch, perform this task in privileged mode:
With PVST+ mode enabled, this example shows how to enable UplinkFast with a station-update rate of
40 packets per 100 milliseconds and how to verify that UplinkFast is enabled:
Console> (enable)
set spantree uplinkfast enable
VLANs 1-4094 bridge priority set to 49152.
The port cost and portvlancost of all ports set to above 3000.
Station update rate set to 15 packets/100ms.
uplinkfast all-protocols field set to off.
uplinkfast enabled for bridge.
Task
Command
Step 1
Enable UplinkFast on the switch.
set spantree uplinkfast enable
[
rate
station_update_rate
]
[
all-protocols
off
|
on
]
Step 2
Verify that UplinkFast is enabled.
show spantree uplinkfast
[{
mistp-instance
[
instances
]}|
vlans
]
