network simulator for service provider

is there anysi network simulator for carrier networks ? well, from 2023 to 2024 there happes so many carrier network outage caused by network operation. to my limited knowledge , SP guru from riverbed could simulate carrier network. but I just checked riverbed website, SP guru

Any way to collect network usage data for dial-up subscriber

NANOGers , is there anyway for AAA to get special online subscriber usage information without enable interim accouting on BRAS? Reading through RADIUS protocol , it seems that if we want to get online subscriber information enable interim accounting on BRAS is the only way . But