The value of tmnxLudbRadproxCacheService specifies the VPRN service
instance ID of the RADIUS Proxy server whose cache
this row is referring to.
The value zero means either
- that the RADIUS Proxy server is not specified
(tmnxLudbRadproxCacheServer is empty), or
- that the RADIUS Proxy server is in the Base router instance
(tmnxLudbRadproxCacheServer not empty).