This read-only Counter tracks the number of unsuccessful attempts to allocate memory from the routing table heap. An administrator treats any nonzero value here as more urgent than a rising discard counter like ppeRipRouteDiscards, since this reflects the heap itself running out of memory rather than a table-size limit. For example, the admin escalates immediately upon seeing ppeRouteMemoryFailures increment, recognizing it indicates actual memory exhaustion in the routing heap.