vi
Operating Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
MSTP Compatibility with RSTP or STP . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Configuring MSTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Planning an MSTP Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
MSTP Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Configuring MSTP Operation Mode and Global Settings . . . . . . . . . . 3-19
Configuring MSTP Per-Port Parameters . . . . . . . . . . . . . . . . . . . . . . . 3-24
Configuring Per Port Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Configuring BPDU Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Configuring BPDU Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
PVST Protection and Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Configuring MST Instance Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Configuring MST Instance Per-Port Parameters . . . . . . . . . . . . . . . . . 3-39
Enabling or Disabling Spanning Tree Operation . . . . . . . . . . . . . . . . . 3-42
Enabling an Entire MST Region at Once or
Exchanging One Region Configuration for Another . . . . . . . . . . 3-42
MSTP VLAN Configuration Enhancement . . . . . . . . . . . . . . . . . . . . . . 3-44
PreConfiguring VLANs in an MST Instance . . . . . . . . . . . . . . . . . 3-45
Configuring MSTP Instances with the VLAN Range Option . . . . 3-46
Operating Notes for the VLAN Configuration Enhancement . . . 3-48
How to Save Your Current Configuration . . . . . . . . . . . . . . . . . . . 3-49
Displaying MSTP Statistics and Configuration . . . . . . . . . . . . . . . . . 3-51
Displaying Global MSTP Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Displaying Detailed Port Information . . . . . . . . . . . . . . . . . . . . . . 3-54
Displaying Status for a Specific MST Instance . . . . . . . . . . . . . . . 3-55
Displaying the MSTP Configuration . . . . . . . . . . . . . . . . . . . . . . . 3-56
Troubleshooting an MSTP Configuration . . . . . . . . . . . . . . . . . . . . . . 3-60
Displaying the Change History of Root Bridges . . . . . . . . . . . . . . . . . 3-60
Displaying Debug Counters for All MST Instances . . . . . . . . . . . . . . . 3-63
Displaying Debug Counters for One MST Instance . . . . . . . . . . . . . . 3-64
Displaying Debug Counters for Ports in an MST Instance . . . . . . . . . 3-66
Field Descriptions in MSTP Debug Command Output . . . . . . . . . . . . 3-68
Troubleshooting MSTP Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71
Loop Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-72
Configuring Loop Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74
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