ii
Configuration restrictions and guidelines ··········································································································· 28
Enabling MAC Information globally ··················································································································· 28
Enabling MAC Information on an interface ······································································································· 29
Configuring MAC Information mode ·················································································································· 29
Configuring the interval for sending syslog or trap messages ········································································· 29
Configuring the MAC Information cache queue length ···················································································· 29
MAC Information configuration example ···················································································································· 30
Configuring Ethernet link aggregation ····················································································································· 32
Overview ········································································································································································· 32
Basic concepts ······················································································································································· 32
Aggregating links in static mode ························································································································· 35
Aggregating links in dynamic mode ··················································································································· 36
Load sharing criteria for link aggregation groups ····························································································· 38
Ethernet link aggregation configuration task list ········································································································· 38
Configuring an aggregation group ····························································································································· 38
Configuring a static aggregation group ············································································································· 39
Configuring a dynamic aggregation group ······································································································· 39
Configuring an aggregate interface ···························································································································· 40
Configuring the description of an aggregate interface ····················································································· 40
Enabling link state traps for an aggregate interface ························································································· 41
Setting the minimum number of Selected ports for an aggregation group ····················································· 41
Shutting down an aggregate interface ··············································································································· 42
Restoring the default settings for an aggregate interface ················································································· 42
Configuring load sharing criteria for link aggregation groups ················································································· 43
Displaying and maintaining Ethernet link aggregation ····························································································· 44
Ethernet link aggregation configuration examples ····································································································· 45
Layer 2 static aggregation configuration example ···························································································· 45
Layer 2 dynamic aggregation configuration example ······················································································ 47
Layer 2 aggregation load sharing configuration example ··············································································· 48
Configuring port isolation ·········································································································································· 52
Assigning ports to the isolation group ························································································································· 52
Displaying and maintaining the isolation group ········································································································ 52
Port isolation configuration example···························································································································· 53
Configuring spanning tree protocols ························································································································ 54
STP ··················································································································································································· 54
STP protocol packets ············································································································································· 54
Basic concepts in STP ············································································································································ 55
Calculation process of the STP algorithm ··········································································································· 56
RSTP ················································································································································································· 61
PVST ················································································································································································· 61
MSTP ················································································································································································ 61
STP, RSTP, and PVST limitations ·························································································································· 61
MSTP features ························································································································································ 62
MSTP basic concepts ············································································································································ 62
How MSTP works ·················································································································································· 65
Implementation of MSTP on devices ···················································································································· 66
Protocols and standards ················································································································································ 66
Spanning tree configuration task lists ·························································································································· 66
Configuration restrictions and guidelines ··········································································································· 67
STP configuration task list ····································································································································· 67
RSTP configuration task list ··································································································································· 68
PVST configuration task list··································································································································· 69
MSTP configuration task list ································································································································· 70
