Troubleshooting guide

1-62
Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring Application Acceleration
Managing Application Acceleration
Step 5 If you are deploying the WAE across a high Bandwidth-Delay-Product (BDP) link, you can set
recommended values for the send and receive buffer sizes by clicking the Set High BDP recommended
values button. For more information about calculating TCP buffers for high BDP links, see the
“Calculating the TCP Buffers for High BDP Links” section on page 1-62.
Step 6 Click Submit.
Note If the original and optimized maximum segment sizes are set to their default values and you configure a
jumbo MTU setting, the segment sizes are changed to the jumbo MTU setting minus 68 bytes. If you
have configured custom maximum segment sizes, their values are not changed if you configure a jumbo
MTU. For more information on jumbo MTU, see the “Configuring a Jumbo MTU” section on page 1-21.
To configure TCP keepalives from the CLI, use the tfo tcp keepalive global configuration command.
To configure TCP acceleration settings from the CLI, use the following global configuration commands:
tfo tcp optimized-mss, tfo tcp optimized-receive-buffer, tfo tcp optimized-send-buffer, tfo tcp
original-mss, tfo tcp original-receive-buffer, and tfo tcp original-send-buffer.
To show the TCP buffer sizes, use the show tfo tcp EXEC command.
Calculating the TCP Buffers for High BDP Links
WAAS software can be deployed in different network environments, involving multiple link
characteristics such as bandwidth, latency, and packet loss. All WAAS devices are configured to
accommodate networks with maximum Bandwidth-Delay-Product (BDP) of up to the values listed
below:
Table 1-6 TCP Settings
TCP Setting Description
Optimized Side
Maximum Segment Size Maximum packet size allowed between this WAAS device and other
WAAS devices participating in the optimized connection. The default is
1432 bytes.
Send Buffer Size Allowed TCP sending buffer size (in kilobytes) for TCP packets sent
from this WAAS device to other WAAS devices participating in the
optimized connection. The default is 32 KB.
Receive Buffer Size Allowed TCP receiving buffer size (in kilobytes) for incoming TCP
packets from other WAAS devices participating in the optimized
connection. The default is 32 KB.
Original Side
Maximum Segment Size Maximum packet size allowed between the origin client or server and
this WAAS device. The default is 1432 bytes.
Send Buffer Size Allowed TCP sending buffers size (in kilobytes) for TCP packets sent
from this WAAS device to the origin client or server. The default is
32 KB.
Receive Buffer Size Allowed TCP receiving buffer size (in kilobytes) for incoming TCP
packets from the origin client or server. The default is 32 KB.