
To troubleshoot [EtherChannel](/etherchannel)  issues on Cisco IOS switches, it is essential to verify the status and configuration of the involved interfaces. Here are some key commands to use:

1. `show etherchannel 1 detail`: Provides detailed information about the EtherChannel group.
2. `show running-config interface po1`: Displays the running configuration for the PortChannel interface.
3. `show running-config interface gigabitethernet0/0`: Shows the running configuration for the GigabitEthernet interface 0/0.
4. `show running-config interface gigabitethernet0/1`: Shows the running configuration for the GigabitEthernet interface 0/1.

By comparing the output of these commands on both devices, you can identify discrepancies or misconfigurations that may be causing issues.

Links:

https://forum.networklessons.com/t/layer-3-etherchannel-on-cisco-ios-switch/1085/77?u=lagapidis

https://networklessons.com/switching/troubleshooting-etherchannel

EtherChannel - Troubleshooting on Cisco IOS Switches

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EIGRP - Summarization per interface

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