iii
Excluding a subnet from load sharing on aggregate links ·································································· 62
Displaying and maintaining Ethernet link aggregation ······································································ 63
Ethernet link aggregation configuration examples ··········································································· 64
Layer 2 static aggregation configuration example ····································································· 64
Layer 2 dynamic aggregation configuration example ································································· 66
Layer 2 aggregation load sharing configuration example ···························································· 68
Layer 2 edge aggregate interface configuration example ··························································· 70
Layer 3 static aggregation configuration example ····································································· 71
Layer 3 dynamic aggregation configuration example ································································· 73
Layer 3 aggregation load sharing configuration example ···························································· 74
Layer 3 edge aggregate interface configuration example ··························································· 76
Configuring port isolation ································································· 78
Assigning a port to an isolation group ··························································································· 78
Displaying and maintaining port isolation ······················································································· 78
Port isolation configuration example ····························································································· 79
Network requirements ········································································································ 79
Configuration procedure ····································································································· 79
Verifying the configuration ··································································································· 79
Configuring spanning tree protocols ··················································· 81
STP ······································································································································ 81
STP protocol frames ·········································································································· 81
Basic concepts in STP ········································································································ 83
Calculation process of the STP algorithm ··············································································· 84
RSTP ···································································································································· 90
RSTP protocol frames ········································································································ 90
Basic concepts in RSTP ····································································································· 91
How RSTP works ·············································································································· 91
RSTP BPDU processing ····································································································· 92
PVST ···································································································································· 92
PVST protocol frames ········································································································ 92
Basic concepts in PVST ······································································································ 93
How PVST works ·············································································································· 93
MSTP ···································································································································· 93
MSTP features ·················································································································· 93
MSTP protocol frames ········································································································ 94
MSTP basic concepts ········································································································· 95
How MSTP works ·············································································································· 98
MSTP implementation on devices ························································································· 99
Rapid transition mechanism ································································································· 99
Protocols and standards ·········································································································· 102
Spanning tree configuration task lists ························································································· 102
STP configuration task list ································································································· 103
RSTP configuration task list ······························································································· 103
PVST configuration task list ······························································································· 104
MSTP configuration task list ······························································································ 105
Setting the spanning tree mode ································································································· 106
Configuring an MST region ······································································································ 106
Configuring the root bridge or a secondary root bridge ··································································· 107
Configuring the device as the root bridge of a specific spanning tree ·········································· 107
Configuring the device as a secondary root bridge of a specific spanning tree ······························ 108
Configuring the device priority ··································································································· 108
Configuring the maximum hops of an MST region ········································································· 108
Configuring the network diameter of a switched network································································· 109
Setting spanning tree timers ····································································································· 109
Configuration restrictions and guidelines ·············································································· 110
Configuration procedure ··································································································· 110
Setting the timeout factor ········································································································· 111
Configuring the BPDU transmission rate ····················································································· 111
Configuring edge ports ············································································································ 112
Configuration restrictions and guidelines ·············································································· 112
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