Contents
xii
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-03
Learning State
10-7
Forwarding State
10-8
Disabled State
10-8
STP Address Management
10-8
STP and IEEE 802.1Q Trunks
10-8
VLAN-Bridge STP
10-9
STP and Redundant Connectivity
10-9
Accelerated Aging to Retain Connectivity
10-10
Understanding Advanced STP Features
10-10
Understanding Port Fast
10-10
Understanding BPDU Guard
10-11
Understanding UplinkFast
10-12
Understanding Cross-Stack UplinkFast
10-13
How CSUF Works
10-14
Events that Cause Fast Convergence
10-15
Limitations
10-16
Connecting the Stack Ports
10-16
Understanding BackboneFast
10-18
Understanding Root Guard
10-20
Understanding EtherChannel Guard
10-20
Configuring Basic STP Features
10-21
Default STP Configuration
10-21
Disabling STP
10-22
Configuring the Root Switch
10-22
Configuring a Secondary Root Switch
10-24
Configuring STP Port Priority
10-26
Configuring STP Path Cost
10-27
Configuring the Switch Priority of a VLAN
10-28
Configuring the Hello Time
10-29
Configuring the Forwarding-Delay Time for a VLAN
10-29
Configuring the Maximum-Aging Time for a VLAN
10-30
Configuring STP for Use in a Cascaded Stack
10-30
Displaying STP Status
10-31
Configuring Advanced STP Features
10-32
Configuring Port Fast
10-32
Configuring BPDU Guard
10-33
Configuring UplinkFast for Use with Redundant Links
10-34
Configuring Cross-Stack UplinkFast
10-35
Configuring BackboneFast
10-36
