Troubleshooting guide

1-63
Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring Application Acceleration
Managing Application Acceleration
• WAE-512—Default BDP is 32 KB
• WAE-612—Default BDP is 512 KB
• WAE-674 —Default BDP is 2048 KB
• WAE-7341 —Default BDP is 2048 KB
• WAE-7371 —Default BDP is 2048 KB
• All WAVE platforms—Default BDP is 2048 KB
If your network provides higher bandwidth or higher latencies are involved, use the following formula
to calculate the actual link BDP:
BDP [Kbytes] = (link BW [Kbytes/sec] * Round-trip latency [Sec])
When multiple links 1..N are the links for which the WAE is optimizing traffic, the maximum BDP
should be calculated as follows:
MaxBDP = Max (BDP(link 1),..,BDP(link N))
If the calculated MaxBDP is greater than the DefaultBDP for your WAE model, the Acceleration TCP
settings should be modified to accommodate that calculated BDP.
Once you calculate the size of the Max BDP, enter a value that is equal to or greater than twice the Max
BDP in the Send Buffer Size and Receive Buffer Size for the optimized connection on the Acceleration
TCP Settings window.
Note These manually configured buffer sizes apply only if TCP adaptive buffering is disabled. TCP adaptive
buffering is normally enabled, and allows the WAAS system to dynamically vary the buffer sizes. For
more information on TCP adaptive buffering, see the “Modifying the TCP Adaptive Buffering Settings”
section on page 1-63.
Modifying the TCP Adaptive Buffering Settings
In most cases, you do not need to modify the acceleration TCP adaptive buffering settings because your
WAAS system automatically configures the TCP adaptive buffering settings based on the network
bandwidth and delay experienced by each connection. Adaptive buffering allows the WAAS software to
dynamically vary the size of the send and receive buffers to increase performance and more efficiently
use the available network bandwidth.
To modify the acceleration TCP adaptive buffering 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 Adaptive Buffering Settings. The TCP Adaptive Buffering
Settings window appears.
Step 3 To enable TCP adaptive buffering, check the Enable check box. The default is enabled.
Step 4 In the Send Buffer Size and Receive Buffer Size fields, enter the maximum size in kilobytes of the send
and receive buffers.
Step 5 Click Submit.