AAA Server Stress Testing — How to Validate Carrier-Grade Performance

Every AAA vendor publishes a transactions-per-second (TPS) figure, but few say what traffic produced it. A PAP request answered from cache and an EAP-SIM authentication waiting on an HSS lookup both count as one authentication. The second costs the server far more work. That gap is why a vendor’s TPS rarely matches what your network sees in production.

Our new guide to AAA server stress testing sets out a method for validating any authentication, authorization and accounting platform, ours included, against the traffic it will actually carry.

It starts with a traffic profile built from at least two weeks of your own NAS and AAA logs. The profile includes authentication method mix, accounting ratio and interim interval, CoA and Disconnect volume, backend latency from LDAP, HSS or SQL, and the number of NAS clients sending traffic. If you get these wrong, the test measures a network you don’t have.

From there, the guide covers nine scenarios a carrier-grade AAA platform should pass:

  1. Throughput ramp to saturation
  2. Sustained peak soak (24–72 hours)
  3. Re-authentication storm after power restoration
  4. Accounting burst with zero lost records
  5. Node failure under load
  6. Site failure and geo-failover
  7. Slow or unavailable backend
  8. Malformed, replayed and rogue traffic
  9. Rolling upgrade under load

Each scenario explains what to run, what to watch and what a pass looks like.

The guide also gives starting-point acceptance criteria:

  • p99 latency inside budget
  • system errors below 0.1%
  • zero session loss on failover
  • zero lost or duplicated accounting records

It recommends locking these into the PoC scorecard before the first packet is sent.

For tool selection, there’s a side-by-side comparison of RADIUS and Diameter load testing options. On the open-source side it covers radclient, radperf, eapol_test and Seagull. On the commercial side it covers Spirent Landslide and Keysight IxLoad. It also explains when a custom harness is worth building. It also shows how to build stress testing into an AAA migration with parallel runs and rollback points.

If you’re evaluating an AAA platform or planning a cutover, take this checklist into your next vendor conversation. Read more- AAA Server Stress Testing — How to Validate Carrier-Grade Performance

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