Contents
8
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Preconfiguration Tasks 6
Configuring 802.1Q Tunnel Ports 6
Configuring the Switch to Tag Native VLAN Traffic 7
Understanding How Layer 2 Protocol Tunneling Works 7
Configuring Support for Layer 2 Protocol Tunneling 8
CHAPTER
15 Configuring STP and IEEE 802.1s MST 1
Understanding How STP Works 2
STP Overview 2
Understanding the Bridge ID 3
Understanding Bridge Protocol Data Units 4
Election of the Root Bridge 4
STP Protocol Timers 5
Creating the Spanning Tree Topology 5
STP Port States 6
STP and IEEE 802.1Q Trunks 12
Understanding How IEEE 802.1w RSTP Works 13
IEEE 802.1w RSTP Overview 13
RSTP Port Roles 13
RSTP Port States 14
Rapid-PVST 14
Understanding How IEEE 802.1s MST Works 14
IEEE 802.1s MST Overview 15
MST-to-PVST Interoperability 16
Common Spanning Tree 18
MST Instances 18
MST Configuration Parameters 18
MST Regions 19
Message Age and Hop Count 20
Default STP Configuration 21
STP and MST Configuration Guidelines 21
Configuring STP 22
Enabling STP 23
Enabling the Extended System ID 24
Configuring the Root Bridge 25
Configuring a Secondary Root Bridge 26
Configuring STP Port Priority 27
Configuring STP Port Cost 29
Configuring the Bridge Priority of a VLAN 30