If a load balancing virtual server is configured to listen on a
particular IP address and port combination, it takes precedence
over the cache redirection virtual server for any requests destined
for that address-port combination. Therefore, the cache redirection
virtual server does not process those requests.
If you want to override this functionality and let the cache
redirection virtual server decide whether the request should be
served from the cache or not, configure the particular load
balancing virtual server to be cacheable.
Such a configuration is typically used when an ISP
uses a NetScaler appliance at the edge of its network and all
traffic flows through the appliance.