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Versions of PBURST.NLM earlier than 2.02 had problems that also
led to insufficient performance in both compression and non-
compression environments. It is therefore recommended that
version 2.02 or later be used. Similar reasoning is used in the VLM
1.1 client software recommendation.
Conclusion
There are many tradeoffs associated with the various compression
techniques available on the market. Particularly, with software-based
algorithms, understanding the effects on CPU utilization becomes critical to
designing router networks that maximize available bandwidth. Performance
testing has shown that there are no performance issues with the HP
AdvanceStack Router 650 running compression on all WAN links at 64
Kbit/s, or combinations of compression and non-compression links up to 256
Kbit/s. With the fixed-port routers, there are certain limitations of the
software-based HP PPC algorithm that impose some design constraints with
respect to supported link speeds and number of links that can run compres-
sion on a given router. Compression ratios can vary widely depending on
the type of data used for the compression test; however, the HP PPC ratios
are approximately 1.5:1 for random LAN traffic.
Data Compression for WAN Links
Conclusion
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