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Configuration guidelines ······································································································································ 29
Configuring a static aggregation group ············································································································· 30
Configuring a dynamic aggregation group ······································································································· 31
Configuring an aggregate interface ···························································································································· 32
Configuring the description of an aggregate interface ····················································································· 32
Enabling link state traps for an aggregate interface ························································································· 32
Shutting down an aggregate interface ··············································································································· 33
Configuring load sharing for link aggregation groups ······························································································ 33
Displaying and maintaining Ethernet link aggregation ····························································································· 34
Ethernet link aggregation configuration examples ····································································································· 34
Layer 2 static aggregation configuration example ···························································································· 34
Layer 2 dynamic aggregation configuration example ······················································································ 36
Port isolation configuration ········································································································································ 39
Introduction to port isolation ········································································································································· 39
Configuring an isolation group ···································································································································· 39
Adding a port to an isolation group ··················································································································· 39
Displaying and maintaining isolation groups ············································································································· 40
Port isolation configuration example···························································································································· 40
Spanning tree configuration ······································································································································ 42
STP ··················································································································································································· 42
STP protocol packets ············································································································································· 42
Basic concepts in STP ············································································································································ 43
Calculation process of the STP algorithm ··········································································································· 44
RSTP ················································································································································································· 49
MSTP ················································································································································································ 50
STP and RSTP limitations ······································································································································· 50
MSTP features ························································································································································ 50
MSTP basic concepts ············································································································································ 50
How MSTP works ·················································································································································· 54
Implementation of MSTP on devices ···················································································································· 55
Protocols and standards ················································································································································ 55
Spanning tree configuration task list ···························································································································· 55
Configuring the spanning tree ······································································································································ 57
Setting the spanning tree mode ··························································································································· 57
Configuring an MST region ································································································································· 58
Configuring the root bridge or a secondary root bridge ·················································································· 58
Configuring the device priority ···························································································································· 59
Configuring the maximum hops of an MST region ··························································································· 60
Configuring the network diameter of a switched network ················································································ 60
Configuring spanning tree timers ························································································································ 61
Configuring the timeout factor ····························································································································· 62
Configuring the maximum port rate ···················································································································· 62
Configuring edge ports ········································································································································· 63
Configuring path costs of ports ···························································································································· 64
Configuring the port priority ································································································································ 66
Configuring the port link type ······························································································································ 66
Configuring the mode a port uses to recognize/send MSTP packets ····························································· 67
Enabling the output of port state transition information ···················································································· 68
Enabling the spanning tree feature ····················································································································· 68
Performing mCheck ··············································································································································· 69
Configuring the VLAN Ignore feature ················································································································· 70
Configuring Digest Snooping ······························································································································· 71
Configuring No Agreement Check······················································································································ 73
