For interfaces to form an EtherChannel on a Cisco switch, they must have identical configurations, including matching speed and duplex settings. If these settings differ, the EtherChannel will fail to establish properly. Interfaces should be in the same VLAN if configured as access ports or have the same allowed VLANs if configured as trunk ports—not assigned to different VLANs. Enabling port security is not necessary for EtherChannel operation and may interfere if misconfigured. All participating interfaces must be assigned to the same EtherChannel group number; they should not be in different groups.
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Cisco CCNA 200-301
Network Access
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