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Configuring LAN Interfaces

Configuring Fast EtherChannel

IC-34

Cisco IOS Interface Configuration Guide

links. Unicast, broadcast, and multicast traffic is distributed across the links providing higher

performance and redundant parallel paths. In the event of a link failure, traffic is redirected to remaining

links within the Fast EtherChannel without user intervention.

In this release of the Fast EtherChannel feature, IP traffic is distributed over the port-channel interface

while traffic from other routing protocols is sent over a single link. Bridged traffic is distributed based

on the Layer 3 information in the packet. If the Layer 3 information does not exist in the packet, the

traffic is sent over the first link.

Fast EtherChannel supports all features currently supported on the Fast Ethernet interface. You must

configure these features on the port-channel interface rather than on the individual Fast Ethernet

interfaces. Fast EtherChannel connections are fully compatible with Cisco IOS virtual LAN (VLAN)

and routing technologies. The Inter-Switch Link (ISL) VLAN trunking protocol can carry multiple

VLANs across a Fast EtherChannel, and routers attached to Fast EtherChannel links can provide full

multiprotocol routing with support for host standby using Host Standby Router Protocol (HSRP).

The port-channel (consisting of up to four Fast Ethernet interfaces) is treated as a single interface.

Port-channel is used in the Cisco IOS software to maintain compatibility with existing commands on the

Catalyst 5000 switch. You create the Fast EtherChannel by using the interface port-channel interface

configuration command. You can assign up to four Fast Ethernet interfaces to a port-channel by using

the channel-group interface configuration command.

Fast EtherChannel also supports the following two features:

• Support for host standby using Host Standby Router Protocol (HSRP)

For more information about configuring HSRP, refer to the “Configuring IP Services” chapter in the

Cisco IOS IP and IP Routing Configuration Guide.

• Support for Cisco Express Forwarding (CEF) and distributed CEF (dCEF)

For more information about configuring CEF, refer to the “Cisco Express Forwarding” chapter in

the Cisco IOS Switching Services Configuration Guide.

For information on how to configure Ethernet or Fast Ethernet, see the tasks listed in the “Configuring

an Ethernet or Fast Ethernet Interface” section.

Fast EtherChannel Configuration Task List

Perform the tasks in the following sections to configure Fast EtherChannel. To configure Fast

EtherChannel, perform the following required steps:

1. Create a port-channel interface and assign an IP address.

2. Assign the Fast Ethernet interfaces (up to four) to the port-channel interface.

For information on other configuration tasks for the Fast EtherChannel, see the “Configuring an Ethernet

or Fast Ethernet Interface” section.

For information on other commands that can be used by the Fast EtherChannel, refer to the other

configuration guides in the Cisco IOS documentation set.

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Cisco Systems IC-23 Manual de usuario Pagina 12