N-Tron 508TX Installation Manual

Also see for 500 Series: Installation guide

Contents

N-Tron 508TX Installation Manual Manual pdf 44 page image

(Revised 2013-06-21) 44IGMP SnoopingIn factory defaults, IGMP Snooping is enabled, and the switch is Plug and Play for IGMP. IGMP snoopingprovides intelligent network support for multicast applications. In particular, unneeded traffic is reduced.IGMP Snooping is configured via the console and if enabled, then operates dynamically upon each power upand until entering escape to the console terminates it. Also, there can be manual only or manual anddynamic operation (as described below). Note that “static filters” (‘sfilter’ below) can be used whetherIGMP Snooping is enabled or not. At the end of this section, see “Example of an IGMP info screen “ for asummary example.Command Description Commentinfo Displays the currentIGMP settings.disable (orenable)Enable or DisableIGMPChoice is opposite of current staterouters Manage Router Port(s)for IGMP SnoopingRouter Ports can be manually setand/or auto-detected.rfilters Manage RouterMulticast Data FiltersRouter ports can get or not get theIGMP group data (as opposed tocontrols like joins, leaves, andqueries).query Manage QueryGenerationQuery Generation can be manuallyset and/or automatically done.Out of the box, IGMP Snooping will function dynamically without intervention. If some of the devices inthe LAN do not understand IGMP, then manual settings are provided to accommodate them.The Internet Group Management Protocol (IGMP) is a protocol that provides a way for a computer to reportits multicast group membership to adjacent ‘routers’. In this case N-Tron 500 series –A switches providerouter-like functionality. Multicasting allows one computer to send content to multiple other computersthat have identified themselves as interested in receiving the originating computer's content. Multicasting canbe used to transmit only to an audience that has joined (and not left) a multicast group membership. IGMPversion 2 is formally described in the Internet Engineering Task Force (IETF) Request for Comments (RFC)2236. IGMP version 1 is formally described in the Internet Engineering Task Force (IETF) Request forComments (RFC) 1112. The 500 series supports v1 and v2.Example of the IGMP router management screen:CLI\SWITCH\IGMP>routersFor IGMP Snooping, router ports mode is auto.Manually Selected Router Port(s): noneAutomatically detected Router Port(s): noneEnter: <(ESC)> to keep this configuration, OR'A' to Auto-detect plus manual, OR'M' for Manual only, OR'N' for None.Enter A, M, N , (or ESC to exit) >