Contents
vi
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
EtherChannel Configuration Examples 6-12
Configuration Example of a Four-Port Fast EtherChannel 6-12
Configuration Example of a Two-Port Gigabit EtherChannel 6-14
Understanding LACP 6-16
LACP Modes 6-16
LACP Parameters 6-17
Configuring EtherChannel Using LACP 6-18
Specifying the EtherChannel Protocol 6-18
Specifying the System Priority 6-19
Specifying the Port Priority 6-19
Specifying an Administrative Key Value 6-19
Changing the Channel Mode 6-20
Specifying the Channel Path Cost 6-21
Specifying the Channel VLAN Cost 6-21
Clearing LACP Statistics 6-21
Displaying EtherChannel Traffic Utilization 6-21
Disabling an EtherChannel 6-22
Displaying Spanning Tree-Related Information for EtherChannels 6-22
CHAPTER
7 Configuring Spanning Tree 7-1
Understanding How STPs Work 7-2
Understanding How a Topology Is Created 7-2
Understanding How a Switch or Port Becomes the Root Switch or Root Port 7-3
Understanding BPDUs 7-4
Calculating and Assigning Port Costs 7-4
Understanding Spanning Tree Port States 7-5
Understanding How PVST+ and MISTP Modes Work 7-11
PVST+ Mode 7-12
Rapid PVST+ 7-12
MISTP Mode 7-12
MISTP-PVST+ Mode 7-13
Understanding How Bridge Identifiers Work 7-13
MAC Address Allocation 7-13
MAC Address Reduction 7-13
Understanding How MST Works 7-14
Rapid Spanning Tree Protocol 7-16
MST-to-SST Interoperability 7-17
Common Spanning Tree 7-18
MST Instances 7-18
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