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Chapter 19
Configuring Optional Spanning-Tree Features
Beginning in privileged EXEC mode, follow these steps to globally enable the BPDU filtering feature.
This procedure is optional.
Command
Step 1
configure terminal
Step 2
spanning-tree portfast bpdufilter default
Step 3
interface interface-id
Step 4
spanning-tree portfast
Step 5
end
Step 6
show running-config
Step 7
copy running-config startup-config
To disable BPDU filtering, use the no spanning-tree portfast bpdufilter default global configuration
command.
You can override the setting of the no spanning-tree portfast bpdufilter default global configuration
command by using the spanning-tree bpdufilter enable interface configuration command.
Enabling UplinkFast for Use with Redundant Links
UplinkFast cannot be enabled on VLANs that have been configured with a switch priority. To enable
UplinkFast on a VLAN with switch priority configured, first restore the switch priority on the VLAN to
the default value by using the no spanning-tree vlan vlan-id priority global configuration command.
When you enable UplinkFast, it affects all VLANs on the switch stack. You cannot configure UplinkFast
Note
on an individual VLAN.
You can configure the UplinkFast or the CSUF feature for rapid PVST+ or for the MSTP, but the feature
remains disabled (inactive) until you change the spanning-tree mode to PVST+.
Beginning in privileged EXEC mode, follow these steps to enable UplinkFast and CSUF. This procedure
is optional.
Command
Step 1
configure terminal
Step 2
spanning-tree uplinkfast [max-update-rate
pkts-per-second]
78-16180-02
Purpose
Enter global configuration mode.
Globally enable BPDU filtering.
By default, BPDU filtering is disabled.
Specify the interface connected to an end station, and enter
interface configuration mode.
Enable the Port Fast feature.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enable UplinkFast.
(Optional) For pkts-per-second, the range is 0 to 32000 packets per
second; the default is 150.
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.
Catalyst 3750 Switch Software Configuration Guide
Configuring Optional Spanning-Tree Features
19-15
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