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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-02

Chapter 10 Configuring Network Access

Configuring Port Channel Interfaces

This section discusses how to configure port channel interfaces for the ACE appliance. It consists of the

following topics:

• Why Use Port Channels?, page 10-2

• Configuring a Port-Channel Interface, page 10-3

Why Use Port Channels?

A port channel groups multiple physical ports into a single logical port. This is also called “port

aggregation” or “channel aggregation.” A port channel containing multiple physical ports has several

advantages:

• Improves link reliability through physical redundancy.

• Allows greater total throughput to the ACE appliance. For example, four 1-Gigabit Ethernet

interfaces can be aggregated into a single 4 Gigabit channel.

• Allows traffic capacity to be scaled up in the future, without network disruption at that time. A port

channel can do everything a switched port can do, but a switched port cannot do everything a port

channel can do. We recommend that you use a port channel.)

• Provides maximum flexibility of network configuration and focuses network configuration on

VLANs rather than physical cabling

The disadvantage of a port channel is that it requires additional configuration on the switch the ACE is

connected to, as well as the ACE itself. There are many methods of port aggregation implemented by

different switches, and not every method works with ACE.

Using a port channel also requires more detailed knowledge of your network's VLANs, because all

“cabling” to and from the ACE will be handled over VLANs rather than using physical cables.

Nonetheless, use of port channels is highly recommended, especially in a production deployment of

ACE.

Figure 10-1 illustrates a port channel interface.

Figure 10-1 Example of a Port Channel Interface

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