Specifications

Contents
ix
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
MST Regions 15-19
Message Age and Hop Count 15-20
Default STP Configuration 15-21
STP and MST Configuration Guidelines 15-21
Configuring STP 15-22
Enabling STP 15-23
Enabling the Extended System ID 15-24
Configuring the Root Bridge 15-25
Configuring a Secondary Root Bridge 15-26
Configuring STP Port Priority 15-27
Configuring STP Port Cost 15-29
Configuring the Bridge Priority of a VLAN 15-30
Configuring the Hello Time 15-32
Configuring the Forward-Delay Time for a VLAN 15-32
Configuring the Maximum Aging Time for a VLAN 15-33
Enabling Rapid-PVST 15-33
Configuring IEEE 802.1s MST 15-34
Enabling MST 15-34
Displaying MST Configurations 15-36
Configuring MST Instance Parameters 15-39
Configuring MST Instance Port Parameters 15-40
Restarting Protocol Migration 15-40
CHAPTER 16 Configuring Optional STP Features 16-1
Understanding How PortFast Works 16-2
Understanding How BPDU Guard Works 16-2
Understanding How PortFast BPDU Filtering Works 16-2
Understanding How UplinkFast Works 16-3
Understanding How BackboneFast Works 16-4
Understanding How EtherChannel Guard Works 16-6
Understanding How Root Guard Works 16-6
Understanding How Loop Guard Works 16-6
Enabling PortFast 16-8
Enabling PortFast BPDU Filtering 16-10
Enabling BPDU Guard 16-11
Enabling UplinkFast 16-12
Enabling BackboneFast 16-13