What is PIM-SM protocol?
PIM Sparse Mode (PIM-SM) is a multicast routing protocol designed on the assumption that recipients for any particular multicast group will be sparsely distributed throughout the network. In other words, it is assumed that most subnets in the network will not want any given multicast packet.
What is s g State?
S,G) state State that maintains a source-specific tree for source S and group G. ( S,G,rpt) state State that maintains source-specific information about source S on the RP tree for G. For example, if a source is being received on the source-specific tree, it will normally have been pruned off the RP tree.
What is a PIM join message?
When a receiver starts to require data from a PIM-SM network, the receiver’s DR sends a Join message through the reverse path forwarding (RPF) interface towards the RP to instruct the upstream neighbor to forward packets to the receiver. The Join message is sent in the upstream direction hop by hop to set up an RPT.
What does PIM do multicast?
Protocol-Independent Multicast (PIM) is a family of multicast routing protocols for Internet Protocol (IP) networks that provide one-to-many and many-to-many distribution of data over a LAN, WAN or the Internet.
How does PIM multicast work?
When a source becomes active, the source DR encapsulates multicast data packets into a PIM register message and sends them by means of unicast to the RP router. When the source DR receives the PIM join message from the receiver’s DR, it starts sending traffic down all SPTs.
How does PIM-SM work?
PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined rendezvous point (RP). Traffic from this source is relayed to the receivers.
What is the difference between PIM-SM and PIM DM?
PIM-SM generally scales fairly well for wide-area usage. PIM Dense Mode (PIM-DM) uses dense multicast routing. PIM Source-Specific Multicast (PIM-SSM) builds trees that are rooted in just one source, offering a more secure and scalable model for a limited number of applications (mostly broadcasting of content).
What does a PIM system do?
A PIM solution provides a single place to collect, manage, and enrich your product information, create product catalogs, and distribute information to your sales and eCommerce channels.
What is RPF check?
RPF (Reverse Path Forwarding) is used to check the source address of an incoming packet. With unicast traffic, this can be used as a security check. When the router receives a packet, it checks if the source is known and/or the interface that it received the packet on is used to reach the source.
What is PIM in IGMP?
Protocol-Independent Multicast (PIM) is a family of multicast routing protocols for Internet Protocol (IP) networks that provide one-to-many and many-to-many distribution of data over a LAN, WAN or the Internet. PIM uses the unicast routing table for reverse-path forwarding.
Why is PIM SM more efficient?
PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined rendezvous point (RP).
When did RFC 4601 PIM-SM specification come out?
RFC 4601 PIM-SM Specification August 2006 1. Introduction This document specifies a protocol for efficiently routing multicast groups that may span wide-area (and inter-domain) internets.
How does PIM-SM work in multicast mode?
PIM-SM is a multicast routing protocol that can use the underlying unicast routing information base or a separate multicast- capable routing information base. It builds unidirectional shared trees rooted at a Rendezvous Point (RP) per group, and it optionally creates shortest-path trees per source.
What do you need to know about PIM-SM?
PIM-SM is a multicast routing protocol that can use the underlying unicast routing information base or a separate multicast- capable routing information base. It builds unidirectional shared trees rooted at a Rendezvous Point (RP) per group, and optionally creates shortest-path trees per source.