Protocol-Independent Multicast: Difference between revisions

Revision as of 14:27, 25 February 2021

Revision as of 23:10, 9 June 2021

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[[image:IGMP basic architecture.png|thumb|400px|Example of a multicast network architecture]]

'''Protocol-Independent Multicast''' ('''PIM''') is a family of [[multicast routing protocol]]s for [[Internet Protocol]] (IP) networks that provide [[Point-to-multipoint communication|one-to-many]] and [[many-to-many]] distribution of data over a [[LAN]], [[Wide area network|WAN]] or the [[Internet]]. It is termed ''protocol-independent'' because PIM does not include its own [[network topology|topology discovery]] mechanism, but instead uses routing information supplied by other [[routing protocol]]s. PIM is not dependent on a specific unicast routing protocol; it can make use of any unicast routing protocol in use on the network. PIM does not build its own [[routing table]]s. PIM uses the unicast routing table for [[reverse -path forwarding]].<ref name="Cisco Multicast">{{citation |url=https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-2_2_e/multicast/configuration_guide/b_mc_1522e_3750x_3560x_cg/b_mc_3750x_3560x_chapter_011.html |title=IP Multicast Routing Configuration Guide |publisher=[[Cisco]] |access-date=2017-05-27}}</ref>{{rp|56-57}}

There are four variants of PIM: