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Layer 2 static aggregation configuration example ···························································································· 50

Layer 2 dynamic aggregation configuration example ······················································································ 52

Configuring port isolation ·········································································································································· 55

Assigning a port to the isolation group ······················································································································· 55

Displaying and maintaining the isolation group ········································································································ 55

Port isolation configuration example···························································································································· 56

Configuring spanning tree protocols ························································································································ 57

STP ··················································································································································································· 57

STP protocol packets ············································································································································· 57

Basic concepts in STP ············································································································································ 58

Calculation process of the STP algorithm ··········································································································· 59

RSTP ················································································································································································· 64

PVST ················································································································································································· 64

MSTP ················································································································································································ 64

STP, RSTP, and PVST limitations ·························································································································· 64

MSTP features ························································································································································ 64

MSTP basic concepts ············································································································································ 65

How MSTP works ·················································································································································· 69

Implementation of MSTP on devices ···················································································································· 69

Protocols and standards ················································································································································ 69

Spanning tree configuration task list ···························································································································· 70

Configuration restrictions and guidelines ··········································································································· 70

STP configuration task list ····································································································································· 70

RSTP configuration task list ··································································································································· 71

PVST configuration task list··································································································································· 72

MSTP configuration task list ································································································································· 73

Setting the spanning tree mode ···································································································································· 74

Configuring an MST region ·········································································································································· 75

Configuration restrictions and guidelines ··········································································································· 75

Configuration procedure ······································································································································ 75

Configuring the root bridge or a secondary root bridge ·························································································· 76

Configuration restrictions and guidelines ··········································································································· 76

Configuring the current device as the root bridge of a specific spanning tree ·············································· 76

Configuring the current device as a secondary root bridge of a specific spanning tree ······························ 77

Configuring the device priority ····································································································································· 77

Configuring the maximum hops of an MST region ···································································································· 77

Configuring the network diameter of a switched network ························································································· 78

Configuring spanning tree timers ································································································································· 78

Configuration restrictions and guidelines ··········································································································· 79

Configuring the timeout factor ······································································································································ 80

Configuring the maximum port rate ····························································································································· 80

Configuring edge ports ················································································································································· 81

Configuration restrictions and guidelines ··········································································································· 81

Configuring path costs of ports ···································································································································· 81

Specifying a standard for the device to use when it calculates the default path cost ··································· 82

Configuration example ········································································································································· 84

Configuring the port priority ········································································································································· 84

Configuring the port link type ······································································································································· 85

Configuration restrictions and guidelines ··········································································································· 85