What is the difference between IGMP and PIM?
IGMP snooping allows a device to only forward multicast streams to the links on which they have been requested. PIM Sparse mode requires specific designated routers to receive notification of all streams destined to specific ranges of multicast addresses.
How does multicast PIM work?
Routers use PIM Join and Prune messages to join and leave multicast distribution trees. PIM-SM by default uses shared trees, which are multicast distribution trees rooted at some selected node (in PIM, this router is called the Rendezvous Point, or RP) and used by all sources sending to the multicast group.
What is the difference between PIM sparse and dense mode?
PIM sparse mode: this is a “pull” model where we only forward multicast traffic when requested. PIM dense mode: this is a “push” model where we flood multicast traffic everywhere and then prune it when it’s not needed.
How does a PIM protocol work?
PIM (Protocol Independent Multicast) is a multicast routing protocol, that is used to send traffic from a single source to multiple destinations across a network. PIM is a collection of three protocols – PIM Sparse Mode, PIM Dense Mode and PIM Bi-directional .
What is l2 multicast?
Layer 2 multicast is designed to reduce network bandwidth consumption. For example, without Layer 2 multicast, Device B cannot know which interfaces are connected to multicast receivers. Therefore, after receiving a multicast packet from Device A, Device B broadcasts the packet in the packet’s broadcast domain.
What is Bidirectional PIM?
Bidirectional PIM is a different flavor of multicast than what you are probably used to (sparse, dense and sparse-dense mode). Most multicast networks have a couple of sources and many receivers. Bidirectional PIM has been invented for networks where we have many sources and receivers talking to each other.
What is (* G and S G in multicast?
In (S,G), the “S” refers to the unicast IP address of the source. The IP header of the multicast data packet contains S as the packet’s source address. The “G” represents the specific multicast group IP address of concern. The IP header of the multicast data packet contains G as the packet’s destination address.
What is the difference between multicast and anycast?
Multicast addresses are in the range of FF00::/8. The anycast address is very similar to the multicast address, but packets will be delivered to only one random host, instead of the entire group. Anycast address don’t have a specific range, as they are exactly the same as regular unicast addresses.
Is multicast L2 or L3?
L2 multicast is concerned with delivering the multicast stream within a vlan eg. IGMP snooping etc. L3 multicast is concerned with delivering the multicast stream between vlans eg PIM .
Is multicast Layer 2 or Layer 3?
In most cases, multicast packets must pass through Layer 2 switching devices between multicast receivers and Layer 3 multicast routers. After a router forwards multicast packets to a switch, the switch forwards the multicast packets to multicast receivers.
What is the difference between bidirectional PIM and PIM SM?
Bidirectional PIM builds bidirectional shared trees that are rooted at a rendezvous point (RP) address. Bidirectional traffic does not switch to shortest path trees (SPTs) as in PIM-SM and is therefore optimized for routing state size instead of path length.
What is bidirectional Multicast PIM?
Multicast Bidirectional PIM. Bidirectional PIM is a different flavor of multicast than what you are probably used to (sparse, dense and sparse-dense mode). Most multicast networks have a couple of sources and many receivers. Bidirectional PIM has been invented for networks where we have many sources and receivers talking to each other.
What is the recommended RP for PIM bidirectional?
This is required to allow R1 to be the RP for PIM bidirectional. To keep things simple I’m statically configuring the RP. You can also use AutoRP or BSR (Bootstrap) just don’t forget to add the “bidir” keyword.
What is PIM-SM?
Protocol Independent Multicast – Sparse-Mode ( PIM-SM) is a protocol for efficiently routing Internet Protocol (IP) packets to multicast groups that may span wide-area and inter-domain internets.