Guidelines for Configuring Ether Channel Cont

All interfaces must support the same allowed range of VLANs.

Interfaces in the same bundle can support varying port costs.

Port-channel interface configuration changes affect the EtherChannel. .

Physical interface configuration changes affect the interface only. .

■ Range of VLANs: An EtherChannel supports the same allowed range of VLANs on all the interfaces in a trunking Layer 2 EtherChannel.

If the allowed range of VLANs is not the same, the interfaces do not form an EtherChannel, even when set to auto or desirable mode. For Layer 2 EtherChannels, either assign all interfaces in the EtherChannel to the same VLAN or configure them as trunks.

■ STP path cost: Interfaces with different STP port path costs can form an EtherChannel as long they are otherwise compatibly configured. Setting different STP port path costs does not, by itself, make interfaces incompatible for the formation of an EtherChannel.

■ Port channel versus interface configuration: After you configure an EtherChannel, any configuration that you apply to the port-channel interface affects the EtherChannel. Any configuration that you apply to the physical interfaces affects only the specific interface you configured.

Building Cisco Multilayer Switched Networks (BCMSN) v3.0

© 2006 Cisco Systems, Inc.

0 0

Post a comment