
iv
Configuring Ethernet link-aggregation·························································································································26
Basic concepts ······················································································································································· 26
Using aggregating links in static mode ·············································································································· 29
Using aggregating links in dynamic mode········································································································· 30
Using load-sharing criteria for link-aggregation groups ··················································································· 32
Using the Ethernet link-aggregation configuration task list························································································ 32
Configuring an aggregation group ····························································································································· 32
Configuring a Layer 2 static aggregation group······························································································· 33
Configuring a Layer 2 dynamic aggregation group························································································· 34
Configuring an aggregate interface ···························································································································· 35
Configuring the description of an aggregate interface····················································································· 35
Enabling link state traps for an aggregate interface ························································································· 35
Shutting down an aggregate interface ··············································································································· 36
Restoring the default settings for an aggregate interface ················································································· 36
Configuring load sharing for link-aggregation groups······························································································ 36
Configuring load-sharing criteria for link-aggregation groups········································································· 36
Enabling local-first load sharing for link-aggregation ······················································································· 38
Enabling link-aggregation traffic redirection······································································································ 38
Displaying and maintaining Ethernet link-aggregation······························································································ 39
Configuring Ethernet link-aggregation························································································································· 39
Setting an example Layer 2 static aggregation configuration ········································································· 40
Setting an example Layer 2 dynamic aggregation configuration ··································································· 42
Configuring port isolation·············································································································································44
Configuring an isolation group ···································································································································· 44
Assigning a port to the isolation group ·············································································································· 44
Displaying isolation groups ·········································································································································· 44
Using a port isolation configuration····························································································································· 45
Configuring the spanning tree······································································································································46
Using STP protocol packets ·································································································································· 46
Outlining the basic concepts in STP ···················································································································· 46
Performing the calculation process of the STP algorithm ·················································································· 47
Using RSTP ····························································································································································· 53
Using PVST······································································································································································ 53
Using MSTP····································································································································································· 53
Limitations of STP, RSTP, and PVST ····················································································································· 53
MSTP features ························································································································································ 54
MSTP basic concepts ············································································································································ 54
Using MSTP···························································································································································· 58
Implementing MSTP on devices ··························································································································· 58
Protocols and standards················································································································································ 58
Configuration task lists ·················································································································································· 59
Configuring the spanning tree······································································································································ 63
Setting the spanning tree mode··························································································································· 63
Configuring an MST region ································································································································· 64
Configuring the root bridge or a secondary root bridge·················································································· 65
Configuring the device priority···························································································································· 66
Configuring the maximum hops of an MST region ··························································································· 66
Configuring the network diameter of a switched network················································································ 67
Configuring spanning tree timers ························································································································ 67
Configuring the timeout factor ····························································································································· 68
Configuring the maximum port rate ···················································································································· 69
Configuring edge ports ········································································································································ 69
Configuring port path costs·································································································································· 70
Configuring port priority······································································································································· 72