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The configuration steps are listed below:
SwitchA#config
SwitchA (Config)#interface eth 1/1
SwitchA (Config-Ethernet1/1)# port-group 1 mode on
SwitchA (Config-Ethernet1/1)#exit
SwitchA (Config)#interface eth 1/2
SwitchA (Config-Ethernet1/2)# port-group 1 mode on
SwitchA (Config-Ethernet1/2)#exit
SwitchA (Config)#interface eth 1/3
SwitchA (Config-Ethernet1/3)# port-group 1 mode on
SwitchA (Config-Ethernet1/3)#exit
SwitchA (Config-Ethernet1/4)# port-group 1 mode on
SwitchA (Config-Ethernet1/4)#exit
SwitchB#config
SwitchB (Config)#port-group 2
SwitchB (Config)#interface eth 1/1-4
SwitchB (Config-Port-Range)#port-group 2 mode on
SwitchB (Config-Port-Range)#exit
Configuration result:
Add ports 1, 2, 3, 4 of Switch 1 to port-group 1 in order, and we can see a group in
“on” mode is completely joined forcedly, switch in other ends won’t exchange LACP
BPDU to complete aggregation. Aggregation finishes immediately when the command to
add port 2 to port-group 1 is entered, port 1 and port 2 aggregate to be port-channel 1,
when port 3 joins port-group 1, port-channel 1 of port 1 and 2 are ungrouped and
re-aggregate with port 3 to form port-channel 1. (It should be noted that whenever a new
port joins in an aggregated port group, the group will be ungrouped first and
re-aggregated to form a new group.) Now all four ports in both Switch 1 and Switch 2 are
aggregated in “on” mode and become an aggregated port respectively.
5.4 Port Channel Troubleshooting Help
If problems occur when configuring port aggregation, please first check the following
for causes.
&
Ensure all ports in a port group have the same properties, i.e., whether they are in
full-duplex mode, forced to the same speed, and have the same VLAN properties,
etc. If inconsistency occurs, make corrections.
