3Com S7906E - Switch, Configuration Manual

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Table of Contents
1 MSTP Configuration ··································································································································1-1
Overview ·················································································································································1-1
Introduction to STP ·································································································································1-1
Why STP ·········································································································································1-1
Protocol Packets of STP··················································································································1-1
Basic Concepts in STP····················································································································1-2
How STP works ·······························································································································1-3
Introduction to RSTP·······························································································································1-9
Introduction to MSTP ····························································································································1-10
Why MSTP ····································································································································1-10
Basic Concepts in MSTP···············································································································1-11
How MSTP Works ·························································································································1-14
Implementation of MSTP on Devices ····························································································1-15
Protocols and Standards ···············································································································1-15
MSTP Configuration Task List ··············································································································1-15
Configuring MSTP·································································································································1-17
Configuring an MST Region ··········································································································1-17
Configuring the Root Bridge or a Secondary Root Bridge ····························································1-18
Configuring the Work Mode of an MSTP Device ··········································································1-19
Configuring the Priority of a Device·······························································································1-19
Configuring the Maximum Hops of an MST Region······································································1-20
Configuring the Network Diameter of a Switched Network ···························································1-20
Configuring Timers of MSTP ·········································································································1-21
Configuring the Timeout Factor·····································································································1-22
Configuring the Maximum Port Rate ·····························································································1-23
Configuring Ports as Edge Ports ···································································································1-23
Configuring Path Costs of Ports ····································································································1-24
Configuring Port Priority ················································································································1-26
Configuring the Link Type of Ports ································································································1-27
Configuring the Mode a Port Uses to Recognize/Send MSTP Packets········································1-27
Enabling the Output of Port State Transition Information······························································1-28
Enabling the MSTP Feature ··········································································································1-29
Performing mCheck·······················································································································1-29
Configuring Digest Snooping·········································································································1-30
Configuring No Agreement Check·································································································1-32
Configuring Protection Functions ··································································································1-34
Remotely Configuring MSTP for an ONU ·····························································································1-37
Displaying and Maintaining MSTP ········································································································1-39
MSTP Configuration Example···············································································································1-39