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Switch1 (Config-Ethernet1/2)#exit
Switch1 (Config)#interface eth 1/3
Switch1 (Config-Ethernet1/3)# port-group 1 mode on
Switch1 (Config-Ethernet1/3)#exit
Switch2#config
Switch2 (Config)#port-group 2
Switch2 (Config)#interface eth 1/6
Switch2 (Config-Ethernet1/6)#port-group 2 mode on
Switch2 (Config-Ethernet1/6)#exit
Switch2 (Config)# interface eth 1/8-9
Switch2 (Config-Port-Range)#port-group 2 mode on
Switch2 (Config-Port-Range)#exit
Configuration result:
Add port 1, 2, 3 of Switch1 to port-group1 in order, and we can see joining a group in “on”
mode is completely forced action, switch in other ends won’t exchange LACP PDU to
complete aggregation. Aggregation finishes immediately when command adding port 2 to
port-group1 is entered, port 1 and port 2 aggregates to be port-channel1, when port 3
joins port-group1, port-channel1 of port 1 and 2 are ungrouped and re-aggregate with port
3 to form port-channel1. (it should be noted that whenever a new port joins in an
aggregated port group, the group will be ungrouped first and re-aggregate to form a new
group. Now all three ports in both Switch1 and Switch2 are aggregated in “on” mode and
become an aggregated port respectively.
10.4 Port Channel Troubleshooting Help
10.4.1 Monitor and Debug Commands
10.4.1.1 show port-group
Command: show port-group [<port-group-number>] {brief | detail | load-balance |
port | port-channel}
Parameter: <port-group-number> is the group number of port channel to be displayed,
from 1 to 8; “brief” displays summary information; “detail” displays detailed information;
“load-balance ” displays load balance information; “port” displays member port information;