ii
Configuring a dynamic aggregation group······································································································· 31
Configuring an aggregate interface ···························································································································· 32
Configuring the description of an aggregate interface····················································································· 33
Enabling link state traps for an aggregate interface ························································································· 33
Shutting down an aggregate interface ··············································································································· 33
Configuring load sharing for link aggregation groups······························································································ 34
Configuring load sharing criteria for link aggregation groups········································································ 34
Enabling local-first load sharing for link aggregation······················································································· 35
Enabling link-aggregation traffic redirection··············································································································· 35
Displaying and maintaining Ethernet link aggregation ····························································································· 36
Ethernet link aggregation configuration examples····································································································· 37
Layer 2 static aggregation configuration example···························································································· 37
Layer 2 dynamic aggregation configuration example······················································································ 39
Port isolation configuration········································································································································42
Introduction to port isolation ········································································································································· 42
Configuring an isolation group ···································································································································· 42
Displaying and maintaining isolation groups ············································································································· 43
Port isolation configuration example···························································································································· 43
Spanning tree configuration······································································································································45
STP ··················································································································································································· 45
STP protocol packets ············································································································································· 45
Basic concepts in STP············································································································································ 46
Calculation process of the STP algorithm ··········································································································· 47
RSTP················································································································································································· 53
PVST················································································································································································· 53
MSTP················································································································································································ 53
STP, RSTP, and PVST limitations ·························································································································· 53
MSTP features ························································································································································ 54
MSTP basic concepts ············································································································································ 54
How MSTP works ·················································································································································· 58
Implementation of MSTP on devices···················································································································· 58
Protocols and standards ················································································································································ 58
Spanning tree configuration task lists ·························································································································· 59
STP configuration task list····································································································································· 59
RSTP configuration task list··································································································································· 60
PVST configuration task list··································································································································· 61
MSTP configuration task list ································································································································· 62
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 ··························································································· 67
Configuring the network diameter of a switched network················································································ 67
Configuring spanning tree timers ························································································································ 67
Configuring the timeout factor ····························································································································· 69
Configuring the maximum port rate ···················································································································· 69
Configuring edge ports········································································································································· 70
Configuring path costs of ports···························································································································· 71
Configuring the port priority ································································································································ 73
Configuring the port link type ······························································································································ 74
Configuring the mode a port uses to recognize/send MSTP packets ····························································· 74
Enabling the output of port state transition information ···················································································· 75
