Multicast sparse vs dense

One of the primary difference between Dense and Sparse mode is the multicast technique used. In Dense mode packets are flooded to the entire network and then branches where there are no receivers are eliminated. In Sparse mode packets branches distribution growth as new nodes join the multicast group.

1. What is dense mode in multicast?
2. What is the difference between PIM sparse and dense?
3. What is the difference between PIM-SM and SSM?
4. What is ip PIM sparse dense?
5. How does multicast sparse mode work?
6. Is multicast L2 or L3?
7. What does dense and sparse mean?
8. Why use PIM sparse?
9. What is the difference between IGMP and PIM?
10. How do I choose a PIM?
11. What is PIM ASM?
12. How does PIM Sparse Mode work?
13. Why is PIM used?
14. What is IP PIM SSM range?
15. How do you stop multicast flooding?
16. Should you filter multicast?
17. What layer is PIM?
18. What is PIM dense?
19. What is multicast data transmission mode?
20. Why is Class D used for multicasting?
21. Why use PIM sparse?
22. What is the difference between IGMP and PIM?
23. What is IGMP vs PIM?
24. Is Netflix a multicast or unicast?
25. What are the two approaches to multicasting?
26. What is 224.0 0.0 addresses used for?
27. Does Netflix use multicast?
28. Does multicast use TCP or UDP?
29. Does multicast save bandwidth?

What is dense mode in multicast?

Dense mode multicast is one mode that multicast can use to construct a tree for sending packets to the multicast subscribers. It is an alternative to sparse mode. The basic assumption behind dense mode is that the multicast packet stream has receivers at most locations. Sparse mode assumes relatively fewer receivers.

What is the difference between PIM sparse and dense?

Multicast PIM has three modes: 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.

What is the difference between PIM-SM and SSM?

PIM-SM refers to PIM Sparse Mode. It is one of the modes under Any Source Multicast (ASM), where multicast streams can be received from any multicast source. PIM-SSM refers to PIM Source Specific Multicast, where the receiver can specify from which source it wants to receive a given multicast stream.

What is ip PIM sparse dense?

The 'ip pim sparse-dense mode' command enables PIM to operate in sparse or dense mode, depending on the multicast group. When you enable sparse-dense mode, the interface is treated as dense mode if the multicast group is in dense mode. If the group is in sparse mode, the interface is treated in sparse mode.

How does multicast sparse mode work?

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.

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 .

What does dense and sparse mean?

In mathematics, "sparse" and "dense" often refer to the number of zero vs. non-zero elements in an array (e.g. vector or matrix). A sparse array is one that contains mostly zeros and few non-zero entries. A dense array contains mostly non-zeros.

Why use PIM sparse?

PIM SM Packet flow

To sum up we can say PIM Sparse mode resolves the flooding of multicast on all PIM neighbors routers. The main role of this prevention is RP(Rendezvous Point). PIM sparse mode creates a shared tree and uses reverse path forwarding to share the multicast stream.

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 do I choose a PIM?

A good starting point for PIM selection is to figure out who will be using it. This can help you decide what features you need in your PIM. While some PIM systems charge by the number of users, others charge by the SKU. Therefore, the number of PIM users could be a crucial factor in decision-making.

What is PIM ASM?

The multicast that you are probably familiar with (PIM sparse and dense mode) using IGMPv2 are also known as ASM (Any Source Multicast). This means that the receivers really don't care what source they receive multicast traffic from, all sources are accepted.

How does PIM Sparse Mode work?

PIM-SM (PIM Sparse Mode) assumes that most hosts do not want to receive multicast traffic. It uses a nonflooding multicast model to direct traffic from the source to the interface when there are multicast receivers in the group. As a result, this model sends traffic only to the routers that specifically request it.

Why is PIM used?

Product information management (PIM) systems let users store, enrich, and manage complex product information. PIM tools centralize product-related data, streamlining the process of updating and managing accurate information throughout multiple sales and marketing channels.

What is IP PIM SSM range?

The SSM range is a range of addresses defined for use with the SSM model. By default the PIM SSM group range is 232.0. 0.0/8 for IPv4 and FF3x::/32 for IPv6.

How do you stop multicast flooding?

To disable the flooding of unregistered IPv4 multicast frames in an IGMP-snooping-enabled VLAN, use the ip multicast disable-flooding command in global configuration mode. The following example disables flooding of unregistered IPv4 multicast frames.

Should you filter multicast?

Multicast traffic is frequently filtered when it is either unnecessary (for example, because no applications that utilize multicast are running on the network) or to prevent multicast-based attacks from being initiated (for example, to prevent an attack that uses multicast traffic to saturate a network with bogus ...

What layer is PIM?

PIM is a multicast control plane protocol that advertises multicast sources and receivers over a routed layer 3 network. Layer 3 multicast relies on PIM to advertise information about multicast capable routers, and the location of multicast senders and receivers.

What is PIM dense?

Protocol Independent Multicast - Dense Mode (PIM-DM) is a data-driven multicast routing protocol, which builds source-based multicast distribution trees that operate on the Flood- and-Prune principle. It requires unicast-reachability information, but does not depend on a specific unicast routing protocol.

What is multicast data transmission mode?

In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with physical layer point-to-multipoint communication.

Why is Class D used for multicasting?

The class D IP address space defines the multicasting IP addresses. These addresses do not define individual interfaces, but instead define groups of interfaces. Hence class D addresses are referred to as groups. The class D IP addresses are those in the range 224.0.

Why use PIM sparse?

PIM SM Packet flow

To sum up we can say PIM Sparse mode resolves the flooding of multicast on all PIM neighbors routers. The main role of this prevention is RP(Rendezvous Point). PIM sparse mode creates a shared tree and uses reverse path forwarding to share the multicast stream.

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.

What is IGMP vs PIM?

IGMP (Internet Group Management Protocol) is used by Host devices to tell their Edge Device like a Router that they would like to Join / Leave / Filter Multicast traffic that it (the Router) receives, while PIM (Protocol Independent Multicast) is how Routers exchange Multicast traffic across network devices.

Is Netflix a multicast or unicast?

Unicast is typically used in Over-the-Top (OTT) streaming applications (OTT is a term used to describe streaming over the internet, learn more here), and particularly well suited for VOD content. The best examples of this kind of streaming are Netflix, Hulu, and other streaming providers of this type.

What are the two approaches to multicasting?

For this reason, two different approaches in multicastrouting have been developed:routing using source-basedtreesandrouting using group-shared trees.

What is 224.0 0.0 addresses used for?

0.0 and 224.0. 0.255, inclusive, is reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting.

Does Netflix use multicast?

Multicast traffic needs a protocol like PIM or IGMP which ISP's cannot use in the public network because PIM cannot scale well. The Netflix and other traffic are Unicast because you are only only person who is watching avenger movie example.

Does multicast use TCP or UDP?

Unicast uses TCP (Transmission Control Protocol) for communications while multicast communication uses UDP (User Datagram Protocol).

Does multicast save bandwidth?

Multicast enables a single copy of data transmission from one node to multiple recipients. The transmitting device will forward UDP packets to a multicast IP address and port so all destinations that want to receive the stream can receive the transmission saving bandwidth and network overhead.