PDSN and Home Agent Dimensioning

Typically, the capacity of a PDSN is limited by the total throughput it can support
and the total number of simultaneous PPP sessions. One is likely to find
that the PPP session limit is reached before the throughput limitation.With
today’s technology, limits in the order of 50,000 PPP sessions are common.
For a home agent, the most limiting factor is often the number of supported
Mobile IP binding records. Values of 100,000 to 200,000 binding
records are common. Note that, in some implementations, the PDSN and
home agent may be combined within one physical machine.