| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 1 | WHY SSM |
| 2 | |
| 3 | Benefis of PIM SSM over PIM SM |
| 4 | ------------------------------ |
| 5 | |
| 6 | - SSM consumes minimum link bandwidth |
| 7 | - SSM simplifies multicast address management (specially important for |
| 8 | inter-domain multicast) |
| Everton Marques | 7cb0d4a | 2014-08-19 13:44:37 -0300 | [diff] [blame] | 9 | - SSM (S,G) channels easily provide unique per-application addressing |
| 10 | - SSM does not require MSDP between PIM domains |
| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 11 | - SSM does not suffer instabilities from traffic-driven SPT switchover |
| Everton Marques | 7cb0d4a | 2014-08-19 13:44:37 -0300 | [diff] [blame] | 12 | - SSM is not suscetible to DoS attack from unwanted sources |
| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 13 | - SSM does not use RP. Some RP issues: |
| 14 | - RP is possible point of failure |
| 15 | - RP demands redundancy management |
| 16 | - RP may require PIM dense mode support for RP election |
| 17 | - RP is possible performance bottleneck |
| 18 | - RP may demand lots of extra management |
| Everton Marques | 7cb0d4a | 2014-08-19 13:44:37 -0300 | [diff] [blame] | 19 | - SSM can be deployed in an existing PIM SM network (only the last hop |
| 20 | routers need to support IGMPv3) |
| 21 | - SSM is easier to deploy and maintain |
| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 22 | |
| 23 | PIM-SSM drawbacks |
| 24 | ----------------- |
| 25 | |
| Everton Marques | 7cb0d4a | 2014-08-19 13:44:37 -0300 | [diff] [blame] | 26 | - SSM requires IGMPv3 support on both receivers and last-hop routers |
| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 27 | - SSM may be memory intensive when managing (S,G) states for |
| 28 | many-to-many multicast distribution |
| Everton Marques | 7cb0d4a | 2014-08-19 13:44:37 -0300 | [diff] [blame] | 29 | - SSM will keep (S,G) state as long as there are subscriptions from |
| 30 | receivers, even if the source is not actually sending traffic |
| 31 | |
| Everton Marques | 9830ce2 | 2014-08-19 12:16:11 -0300 | [diff] [blame] | 32 | --EOF-- |