Cisco Wide Area Virtualization Engine 274 Troubleshooting Guide download pdf (Page 421)

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Cisco Wide Area Application Services Configuration Guide

OL-26579-01

Chapter 1 Configuring Application Acceleration

Managing Application Acceleration

Note A default policy which maps to a default class map matching any traffic cannot be deleted.

Step 6 If you determine that a new policy is needed, click the Add Policy taskbar icon to create the policy (see

the “Creating an Optimization Policy” section on page 1-51).

Modifying the Acceleration TCP Settings

In most cases, you do not need to modify the acceleration TCP settings because your WAAS system

automatically configures the acceleration TCP settings based on the hardware platform of the WAE

device. WAAS automatically configures the settings only under the following circumstances:

• When you first install the WAE device in your network.

• When you enter the restore factory-default command on the device. For more information about

this command, see the Cisco Wide Area Application Services Command Reference.

The WAAS system automatically adjusts the maximum segment size (MSS) to match the advertised MSS

of the client or server for each connection. The WAAS system uses the lower of 1432 or the MSS value

advertised by the client or server.

If your network has high BDP links, you may need to adjust the default buffer settings automatically

configured for your WAE device. For more information, see the “Calculating the TCP Buffers for High

BDP Links” section on page 1-62.

If you want to adjust the default TCP adaptive buffering settings for your WAE device, see the

“Modifying the TCP Adaptive Buffering Settings” section on page 1-63.

To modify the acceleration TCP settings, follow these steps:

Step 1 From the WAAS Central Manager menu, choose Devices > device-name (or Device Groups >

device-group-name).

Step 2 Choose Configure > Acceleration > TCP Settings. The Acceleration TCP Settings window appears.

Step 3 Keep the Send TCP Keepalive check box checked.

Checking the Send TCP Keepalive check box allows this WAE device or group to disconnect the TCP

connection to its peer device if no response is received from the TCP keepalive exchange. In this case,

the two peer WAE devices will exchange TCP keepalives on a TCP connection and if no response is

received for the keepalives for a specific period, the TCP connection will be torn down. When the

keepalive option is enabled, any short network disruption in the WAN will cause the TCP connection

between peer WAE devices to be disconnected.

If the Send TCP Keepalive check box is not checked, TCP keepalives will not be sent and connections

will be maintained unless they are explicitly disconnected. By default, this setting is enabled.

Step 4 Modify the TCP acceleration settings as needed. See Table 1-6 for a description of these settings.

For information on how to calculate these settings for high BDP links, see the “Calculating the TCP

Buffers for High BDP Links” section on page 1-62.

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Cisco Wide Area Virtualization Engine 274 Troubleshooting Guide Page 421