Users Guide

291 | BranchController Config for Controllers Dell Networking W-Series ArubaOS 6.4.x| User Guide
Distributed Layer 3 Branch Deployment Model
In the branch deployment model shown in
Figure 43, the IPsec tunnels are terminated on the master
controller. IPsec tunnels are treated as master-local tunnels.
Figure 43 Branch Deployment Model with Master Controller in HQ
Compression/Decompression Engine
The W-7000 SeriesControllers contain the Compression/Decompression Engine (CDE) that compresses the raw
IP payload data and also decompresses the compressed payload data. The CDE compression process is called
Deflation; the decompression process is called Inflation (as defined in
RFC1951).
The key Compression/Decompression Engine features are as follows:
l Four CDE channels on the XLP4XX processor and one CDE channel on the XLP2XX processor
l 2.5 GBps per CDE (Deflation process, Inflation process, or combination of both)
l Deflation context save and restore (at block boundaries)
l Inflation context save and restore (at arbitrary file position)
l Load balancing the input messages to all CDEs
You can split a file or data into blocks, and each block can use the mode of compression that suits it best. In this case,
it is packet data and there will be only one block.
Modes of Operation
There are three modes of operation for the deflation and inflation compression processes:
l Static Compression
For static compression, a predefined Huffman code is used that may not be ideal for the block in question,
but it usually achieves acceptable compression. The advantage of static compression is its speed of
execution.
l Dynamic Compression