Cisco WS-C2948G-GE-TX Configuration Manual page 6

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