hpnicfL4RedirectCachePort holds the ifIndex of the port or link aggregation group that provides the physical connection to the configured web cache device, required when manual cache configuration is used. An admin sets this to tell the switch which local interface to use when forwarding redirected traffic to the cache. For example, an admin manually wiring a cache device into port 24 would set hpnicfL4RedirectCachePort to that port's ifIndex so redirected traffic is switched out the correct interface.