Configuring Optional Spanning-Tree Features - Cisco Catalyst 3550 series Software Configuration Manual

Configuring Optional Spanning-Tree Features

Configuring Optional Spanning-Tree Features
These sections describe how to configure optional spanning-tree features:
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Default Optional Spanning-Tree Configuration
Table 18-1
Table 18-1 Default Optional Spanning-Tree Configuration
Feature
Port Fast, BPDU filtering, BPDU guard
UplinkFast
CSUF
BackboneFast
EtherChannel guard
Root guard
Loop guard
Optional Spanning-Tree Configuration Guidelines
The UplinkFast, BackboneFast, and cross-stack UplinkFast features are not supported with the rapid
PVST+ or the MSTP.
Enabling Port Fast
A port with the Port Fast feature enabled is moved directly to the spanning-tree forwarding state without
waiting for the standard forward-time delay.
Catalyst 3550 Multilayer Switch Software Configuration Guide
18-14
Default Optional Spanning-Tree Configuration, page 18-14
Optional Spanning-Tree Configuration Guidelines, page 18-14
Enabling Port Fast, page 18-14
Enabling BPDU Guard, page 18-15
Enabling BPDU Filtering, page 18-16
Enabling UplinkFast for Use with Redundant Links, page 18-17
Enabling Cross-Stack UplinkFast, page 18-19
Enabling BackboneFast, page 18-20
Enabling EtherChannel Guard, page 18-20
Enabling Root Guard, page 18-21
Enabling Loop Guard, page 18-21
shows the default optional spanning-tree configuration.
Chapter 18
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Default Setting
Globally disabled (unless they are individually configured
per interface).
Globally disabled.
Disabled on all interfaces.
Globally disabled.
Globally enabled.
Disabled on all interfaces.
Disabled on all interfaces.
Configuring Optional Spanning-Tree Features
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