Guidelines for Configuring Ether Channel

All Ethernet interfaces must support EtherChannel with no contingencies.

All interfaces in an EtherChannel must be configured at the same speed and duplex.

EtherChannel will not form if one of the interfaces is a switched port analyzer destination port.

IP addresses must be assigned to port-channel logical interfaces in Layer 3 EtherChannels.

Interfaces must be assigned to the same VLAN or configured as trunks in Layer 2 EtherChannels.

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Follow these guidelines and restrictions when configuring EtherChannel interfaces.

■ EtherChannel support: All Ethernet interfaces on all modules support EtherChannel (maximum of eight interfaces), with no requirement that interfaces be physically contiguous or on the same module.

■ Speed and duplex: Configure all interfaces in an EtherChannel to operate at the same speed and in the same duplex mode. Also, if one interface in the bundle is shut down, it is treated as a link failure, and traffic will traverse other links in the bundle.

■ Switched port analyzer (SPAN) and EtherChannel: An EtherChannel will not form if one of the interfaces is a SPAN destination port.

■ For Layer 3 EtherChannels: Assign Layer 3 addresses to the port-channel logical interface, not to the physical interfaces in the channel.

■ VLAN match: All interfaces in the EtherChannel bundle must be assigned to the same VLAN or be configured as a trunk.

© 2006 Cisco Systems, Inc. Implementing Spanning Tree 3-83

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