N-Tron Switch 708M12 User Manual download pdf (Page 17)

Revision 071108

Page 17 of 102

Snooping is configured via the web console and if enabled, operates dynamically upon each power up.

Also, there can be manual only or manual and dynamic operation. Note that “static multicast group

address” can be used whether IGMP Snooping is enabled or not.

IGMP Snooping will function dynamically without user intervention. If some of the devices in the 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 report its multicast group

membership to adjacent ‘routers’. In this case N-Tron 708 series switches provide router-like functionality.

Multicasting allows one computer to send content to multiple other computers that have identified

themselves as interested in receiving the originating computer's content. Multicasting can be used to

transmit only to an audience that has joined (and not left) a multicast group membership. IGMP version 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 for Comments

(RFC) 1112. The 708 series supports v1 and v2.

N-Ring

N-Ring is enabled by default, and the switch is Plug and Play for N-Ring except that initially one must

enable an N-Ring enabled device to be the N-Ring Manager for a given N-Ring. Subsequently, N-Ring

operates dynamically upon each power up. Using N-Tron's proprietary N-Ring technology offers expanded

ring size capacity, detailed fault diagnostics, and a standard healing time of 30ms. The N-Ring Manager

periodically checks the health of the N-Ring via health check packets. If the N-Ring Manager stops

receiving the health check packets, it times out and converts the N-Ring to a backbone within 30ms. When

using all N-Ring enabled switches in the ring, a detailed ring map and fault location chart is also provided

on the N-Ring Manager’s web browser. N-Ring status is also sent from the N-Ring Manager to the N-View

OPC Server to identify the health status of the ring. Up to 250 N-Ring enabled switches can participate in

one N-Ring topology. Switches that do not have N-Ring capability may be used in an N-Ring, however the

ring map and fault location chart cannot be as detailed at these locations.

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N-Tron Switch 708M12 User Manual Page 17