See Sections 3.1 through 3.4 in the Netra Proxy Cache Array Configuration Guide or, for an individual server, see Sections 3.1 and 3.2 of the Netra Proxy Cache Server Configuration Guide.
For the Netra Proxy Cache Array, this step corresponds to Step 2 through Step 4 in Figure 1-2 and is performed on one array machine for all machines in the array.