Port Channel Troubleshooting - Planet Networking & Communication WGSW-50040 Configuration Manual

SwitchB (Config-If-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, when port 4 joins port-group 1, port-channel 1 of port 1, 2 and
3 are ungrouped and re-aggregate with port 4 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 SwitchA and SwitchB are aggregated in "on" mode and become an
aggregated port respectively.

8.4 Port Channel Troubleshooting

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.
 Some commands cannot be used on a port in port-channel, such as arp, bandwidth, ip, ip-forward, etc.
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