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EtherChannel Configuration Guidelines
- EtherChannel support - All Ethernet interfaces must support EtherChannel with no requirement that interfaces be physically contiguous
- Speed and duplex - Configure all interfaces in an EtherChannel to operate at the same speed and in the same duplex mode
- VLAN match - All interfaces in the EtherChannel bundle must be assigned to the same VLAN or be configured as a trunk (shown in the figure)
- Range of VLANs - An EtherChannel supports the same allowed range of VLANs on all the interfaces in a trunking EtherChannel
If the allowed range of VLANs is not the same, the interfaces do not form an EtherChannel, even when they are set to auto or desirable mode