AMX Wireless Touch Panels (Wave Server) Manual de usuario descargar pdf (Pagina 27)

AMX AV/IT Administrators Guide

Rev. 1.0 (7/29/2014) www.amx.com Page 24

Protocol-Independent Multicast (PIM) is a

family of multicast routing protocols for IP

networks that provide for distribution of

multicast data between routers and across

networks. PIM builds trees (multicast routes)

which ensure shortest path and loop

suppression. There are four varieties of PIM:

PIM Sparse Mode (PIM-SM): Build

trees rooted at a Rendezvous point.

Trees are built before any multicast

packets are sent. PIM-SM can create

shortest path trees for each source.

PIM-SM scales well and is the most

commonly used PIM mode for video

in enterprises.

PIM Dense Mode (PIM-DM): uses dense multicast routing. It creates trees by flooding the

network with all the multicast traffic and pruning back routes that are not subscribed to the

Multicast Group. This is used in applications that almost all hosts are subscribed to a Multicast,

but the flooding can create issues in bandwidth heavy applications like streaming.

Bidirectional PIM: explicitly builds shared bi-directional trees and scales well for applications

that communicate between device pools on multicast. Rarely used for streaming unless

implemented for another application.

PIM Source-Specific Multicast (PIM-SSM): builds trees that are rooted in just one source. It

can be more secure than other implementations because clients subscribe to specific sources.

PIM-SSM requires IGMPV3 to be implemented.

PIM Sparse Mode (PIM-SM)

In PIM-SM Routers can take one of two roles:

Rendezvous Point (RP): The Rendezvous Point is a function on a router which is responsible

for keeping track of multicast sources and building trees to distribute multicast to other routers.

With a Rendezvous Point other routers do not need to know the addresses of the sources for

every multicast group. All they need to know is the IP address of the RP router. The RP router

discovers the sources for all multicast groups and forwards multicast packets to designated

routers requesting them.

The Rendezvous Point function can be manually assigned to routers or can be automatically

assigned. Depending on the streaming application it is typically best to manually assign the RP

designation to the router immediately adjacent to the encoder VLAN. This minimizes

encapsulated data and uses the least router processing power.

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AMX Wireless Touch Panels (Wave Server) Manual de usuario Pagina 27