| Exam 642-885 | Question id=3338 | Multicast Routing in a Service Provider IP NGN Environment |
Which multicast routing protocol is most optimal for supporting many-to-many multicast applications?
| A. |
PIM-SM | |
| B. |
PIM-BIDIR | |
| C. |
MP-BGP | |
| D. |
DVMRP | |
| E. |
MSDP |
PIM-Bidirectional Operations
PIM Bidirectional (BIDIR) has one shared tree from sources to RP and from RP to receivers. This is unlike the PIM-SM, which is unidirectional by nature with multiple source trees - one per (S, G) or a shared tree from receiver to RP and multiple SG trees from RP to sources.
Benefits of PIM BIDIR are as follows:
· As many sources for the same group use one and only state (*, G), only minimal states are required in each router.
· No data triggered events.
· Rendezvous Point (RP) router not required. The RP address only needs to be a routable address and need not exist on a physical device.