Ip Multicast Routing Protocol; Igmp - D-Link DGS-3620-52P Reference Manual

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xStack DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Interface Name
Click the Find button to find the interface entered.
Click the View All button to view all the interfaces configured on this switch.
Click the Edit button to re-configure the selected entry.

IP Multicast Routing Protocol

The functions supporting IP multicasting are found in L3 Features > IP Multicast Routing Protocol. IGMP,
DVMRP, and PIM-DM/SM/SM-DM/SSM can be enabled or disabled on the Switch without changing the individual
protocol's configuration by using the DGS-3620 Web Management Tool.

IGMP

IGMP
Computers and network devices that want to receive multicast transmissions need to inform nearby routers that
they will become members of a multicast group. The Internet Group Management Protocol (IGMP) is used to
communicate this information. IGMP is also used to periodically check the multicast group for members that are no
longer active.
In the case where there is more than one multicast router on a subnetwork, one router is elected as the 'querier'.
This router then keeps track of the membership of the multicast groups that have active members. The information
received from IGMP is then used to determine if multicast packets should be forwarded to a given subnetwork or
not. The router can check, using IGMP, to see if there is at least one member of a multicast group on a given
subnetwork. If there are no members on a subnetwork, packets will not be forwarded to that subnetwork.
IGMP Versions 1 and 2
Multicast groups allow members to join or leave at any time. IGMP provides the method for members and multicast
routers to communicate when joining or leaving a multicast group.
IGMP version 1 is defined in RFC 1112. It has a fixed packet size and no optional data.
The format of an IGMP packet is shown below:
Figure 5-64 RIPng Interface Settings window
Description
Enter the interface name for the RIPng configuration.
Figure 5-65 RIPng Interface Settings Edit window
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