Contents
xiv
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Configuring the Root Switch 14-14
Configuring a Secondary Root Switch 14-15
Configuring the Port Priority 14-16
Configuring the Path Cost 14-17
Configuring the Switch Priority 14-18
Configuring the Hello Time 14-19
Configuring the Forwarding-Delay Time 14-20
Configuring the Maximum-Aging Time 14-20
Configuring the Maximum-Hop Count 14-21
Specifying the Link Type to Ensure Rapid Transitions 14-21
Restarting the Protocol Migration Process 14-22
Displaying the MST Configuration and Status 14-22
CHAPTER
15 Configuring Optional Spanning-Tree Features 15-1
Understanding Optional Spanning-Tree Features 15-1
Understanding Port Fast 15-2
Understanding BPDU Guard 15-2
Understanding BPDU Filtering 15-3
Understanding UplinkFast 15-3
Understanding Cross-Stack UplinkFast 15-5
How CSUF Works 15-6
Events that Cause Fast Convergence 15-7
Limitations 15-8
Connecting the Stack Ports 15-8
Understanding BackboneFast 15-9
Understanding EtherChannel Guard 15-11
Understanding Root Guard 15-12
Understanding Loop Guard 15-13
Configuring Optional Spanning-Tree Features 15-13
Default Optional Spanning-Tree Configuration 15-13
Optional Spanning-Tree Configuration Guidelines 15-14
Enabling Port Fast 15-14
Enabling BPDU Guard 15-15
Enabling BPDU Filtering 15-16
Enabling UplinkFast for Use with Redundant Links 15-17
Enabling Cross-Stack UplinkFast 15-18
Enabling BackboneFast 15-19
Enabling EtherChannel Guard 15-19