Troubleshooting guide

1-1
Cisco Wide Area Application Services Configuration Guide
OL-26579-01
APPENDIX
1
Predefined Optimization Policy
The WAAS software includes over 200 predefined optimization policy rules that help your WAAS
system classify and optimize some of the most common traffic on your network. Table 1-1 lists the
predefined applications and class maps that WAAS will either optimize or pass through based on the
policy rules that are provided with the system.
Before you create an optimization policy, we recommend that you review the predefined policy rules and
modify them as appropriate. Often, you can more easily modify an existing policy rule than create a new
one.
When reviewing Table 1-1, note the following information:
• The subheadings represent the application names, and the associated class maps are listed under
these subheadings. For example, Authentication is a type of application and Kerberos is a class map
for that application.
• Applications and class maps with the word (monitored) next to them are monitored by the WAAS
Central Manager, which can monitor statistics for up to 25 applications and 25 class maps at a time.
To view statistics for one of the unmonitored applications, use one of the following methods:
– Use the WAAS CLI, which can display statistics for all applications and class maps on a WAAS
device. For more information, see the Cisco Wide Area Application Services Command
Reference.
– Modify the application or class map settings so the WAAS Central Manager GUI displays
statistics for the desired application or class map. For more information, see Chapter 1,
“Configuring Application Acceleration.”
• WAAS Express devices have similar default policy rules but provide application acceleration only
for HTTP, SSL, and SMB traffic. Where a different application accelerator is listed in Table 1-1, it
is not part of the WAAS Action for a WAAS Express device.
The WAAS software uses the following optimization technologies based on the type of traffic that it
encounters:
• TFO (transport flow optimization)—A collection of optimization technologies such as automatic
windows scaling, increased buffering, and selective acknowledgement that optimize all TCP traffic
over your network.
• DRE (data redundancy elimination)—A compression technology that reduces the size of transmitted
data by removing redundant information before sending the shortened data stream over the WAN.
DRE operates on significantly larger streams and maintains a much larger compression history than
LZ compression. DRE can use bidirectional, unidirectional, or adaptive caching. Unless noted in
Table 1-1, DRE caching is bidirectional.
• LZ (compression)—Another compression technology that operates on smaller data streams and
keeps limited compression history compared to DRE.