Cisco WS-C2948G-GE-TX - Page 7

Contents
vii
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
MST Configuration 7-18
MST Region 7-19
Message Age and Hop Count 7-21
MST-to-PVST+ Interoperability 7-21
Understanding How BPDU Skewing Works 7-22
Using PVST+ 7-22
Default PVST+ Configuration 7-22
Setting the PVST+ Bridge ID Priority 7-23
Configuring the PVST+ Port Cost 7-25
Configuring PVST+ Port Priority 7-25
Configuring the PVST+ Default Port Cost Mode 7-26
Configuring the PVST+ Port VLAN Cost 7-26
Configuring the PVST+ Port VLAN Priority 7-27
Disabling the PVST+ Mode on a VLAN 7-28
Using Rapid PVST+ 7-28
Using MISTP-PVST+ or MISTP 7-30
Default MISTP Mode Configuration 7-30
Setting the MISTP-PVST+ Mode or MISTP Mode 7-31
Configuring the MISTP Bridge ID Priority 7-32
Enabling an MISTP Instance 7-36
Mapping VLANs to an MISTP Instance 7-36
Disabling MISTP-PVST+ or MISTP 7-39
Configuring a Root Switch 7-39
Configuring a Primary Root Switch 7-39
Configuring a Secondary Root Switch 7-40
Configuring a Root Switch to Improve Convergence 7-41
Using Root Guard—Preventing Switches from Becoming Root 7-43
Displaying Spanning Tree BPDU Statistics 7-43
Configuring Spanning Tree Timers 7-44
Configuring the Hello Time 7-44
Configuring the Forward Delay Time 7-45
Configuring the Maximum Aging Time 7-45
Configuring MST 7-46
Enabling MST 7-46
Mapping and Unmapping VLANs to an MST Instance 7-54
Configuring Spanning Tree BPDU Skewing 7-57