WHY_SSM 1.2 KB

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  1. WHY SSM
  2. Benefis of PIM SSM over PIM SM
  3. ------------------------------
  4. - SSM consumes minimum link bandwidth
  5. - SSM simplifies multicast address management (specially important for
  6. inter-domain multicast)
  7. - SSM (S,G) channels easily provide unique per-application addressing
  8. - SSM does not require MSDP between PIM domains
  9. - SSM does not suffer instabilities from traffic-driven SPT switchover
  10. - SSM is not suscetible to DoS attack from unwanted sources
  11. - SSM does not use RP. Some RP issues:
  12. - RP is possible point of failure
  13. - RP demands redundancy management
  14. - RP may require PIM dense mode support for RP election
  15. - RP is possible performance bottleneck
  16. - RP may demand lots of extra management
  17. - SSM can be deployed in an existing PIM SM network (only the last hop
  18. routers need to support IGMPv3)
  19. - SSM is easier to deploy and maintain
  20. PIM-SSM drawbacks
  21. -----------------
  22. - SSM requires IGMPv3 support on both receivers and last-hop routers
  23. - SSM may be memory intensive when managing (S,G) states for
  24. many-to-many multicast distribution
  25. - SSM will keep (S,G) state as long as there are subscriptions from
  26. receivers, even if the source is not actually sending traffic
  27. --EOF--