Configuring the spanning tree ······································································································································ 41

Setting the spanning tree mode ··························································································································· 41

Configuring an MST region ································································································································· 42

Configuring the root bridge or a secondary root bridge ·················································································· 43

Configuring the device priority ···························································································································· 44

Configuring the maximum hops of an MST region ··························································································· 44

Configuring the network diameter of a switched network ················································································ 45

Configuring spanning tree timers ························································································································ 45

Configuring the timeout factor ····························································································································· 46

Configuring the maximum port rate ···················································································································· 47

Configuring edge ports ········································································································································· 47

Configuring path costs of ports ···························································································································· 48

Configuring the port priority ································································································································ 50

Configuring the port link type ······························································································································ 51

Configuring the mode a port uses to recognize/send MSTP packets ····························································· 52

Enabling the spanning tree feature ····················································································································· 52

Performing mCheck ··············································································································································· 53

Configuring the VLAN Ignore feature ················································································································· 54

Configuring Digest Snooping ······························································································································· 55

Configuring No Agreement Check······················································································································ 57

Configuring protection functions ·························································································································· 59

Displaying and maintaining the spanning tree ··········································································································· 62

MSTP configuration example ········································································································································ 63

Configuring Ethernet link aggregation ····················································································································· 67

Overview ········································································································································································· 67

Basic concepts ······················································································································································· 67

Aggregating links in static mode ························································································································· 70

Aggregating links in dynamic mode ··················································································································· 72

Load sharing criteria for link aggregation groups ····························································································· 74

Ethernet link aggregation configuration task list ········································································································· 74

Configuring an aggregation group ····························································································································· 74

Configuration guidelines ······································································································································ 74

Configuring a static aggregation group ············································································································· 75

Configuring a dynamic aggregation group ······································································································· 77

Configuring an aggregate interface ···························································································································· 79

Configuring the description of an aggregate interface or subinterface ·························································· 79

Configuring the MTU of a Layer 3 aggregate interface or subinterface ························································· 80

Enabling link state traps for an aggregate interface ························································································· 80

Setting the minimum number of Selected ports for an aggregation group ····················································· 81

Shutting down an aggregate interface ··············································································································· 82

Restoring the default settings for an aggregate interface ················································································· 82

Configuring load sharing criteria for link aggregation groups ················································································· 83

Displaying and maintaining Ethernet link aggregation ····························································································· 83

Ethernet link aggregation configuration examples ····································································································· 84

Layer 2 static aggregation configuration example ···························································································· 84

Layer 2 dynamic aggregation configuration example ······················································································ 86

Layer 3 static aggregation configuration example ···························································································· 88

Layer 3 dynamic aggregation configuration example ······················································································ 89

Configuring port isolation ·········································································································································· 91

Introduction to port isolation ········································································································································· 91

Configuring an isolation group ···································································································································· 92

Assigning ports to an isolation group ················································································································· 92

Specifying the uplink port for an isolation group ······························································································ 92