Use of ip pim sparse-mode under vlan interface

[mahesh18]

                   Hi all,

Need to understand why to use  ip pim sparse-mode use under  vlan interface.

Vlan is configured with ip helper address command and also with ip pim sparse-mode.

So we use pim sparse mode  to allow mutlicast traffic across different vlans?

Need to know which multicast traffic it can be ?

Thanks

MAhesh

[smehrnia]

Hi,

ip pim sparse-mode command enables your interface (SVI) to participate in sparse mode multicast traffic transmission and multicast shared tree. this way clients in that VLAN are able to receive multicast traffic from different multicast groups (sources) although you can controll it by configuring other parameters.

PIM Variants:

* PIM Sparse Mode (PIM-SM) explicitly builds unidirectional shared trees rooted at a rendezvous point (RP) per group, and optionally creates shortest-path trees per source. PIM-SM generally scales fairly well for wide-area usage.

* PIM Dense Mode (PIM-DM) uses dense multicast routing. It implicitly builds shortest-path trees by flooding

multicast traffic domain wide, and then pruning back branches of the tree where no receivers are present. PIM-DM is straightforward to implement but generally has poor scaling properties.

* 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 amount of applications (mostly broadcasting of content). In SSM, an IP datagram is transmitted by a source S to an SSM destination address G, and receivers can receive this datagram by subscribing to channel (S,G).

plz Rate if it helped.

Soroush