D-Link DWL-8610AP User Manual

Configuring IGMP Snooping
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 213
D-Link UWS User Manual
Configuring IGMP Snooping
Internet Group Management Protocol (IGMP) Snooping is a feature that allows a switch to forward multicast
traffic intelligently on the switch. Multicast IP traffic is traffic that is destined to a host group. Host groups are
identified by class D IP addresses, which range from 224.0.0.0 to 239.255.255.255. Based on the IGMP query
and report messages, the switch forwards traffic only to the ports that request the multicast traffic. This
prevents the switch from broadcasting the traffic to all ports and possibly affecting network performance.
A traditional Ethernet network may be separated into different network segments to prevent placing too many
devices onto the same shared media. Bridges and switches connect these segments. When a packet with a
broadcast or multicast destination address is received, the switch will forward a copy into each of the
remaining network segments in accordance with the IEEE MAC Bridge standard. Eventually, the packet is
made accessible to all nodes connected to the network.
This approach works well for broadcast packets that are intended to be seen or processed by all connected
nodes. In the case of multicast packets, however, this approach could lead to less efficient use of network
bandwidth, particularly when the packet is intended for only a small number of nodes. Packets will be flooded
into network segments where no node has any interest in receiving the packet. While nodes will rarely incur
any processing overhead to filter packets addressed to un-requested group addresses, they are unable to
transmit new packets onto the shared media for the period of time that the multicast packet is flooded. The
problem of wasting bandwidth is even worse when the LAN segment is not shared, for example in Full Duplex
links.
Allowing switches to snoop IGMP packets is a creative effort to solve this problem. The switch uses the
information in the IGMP packets as they are being forwarded throughout the network to determine which
segments should receive packets directed to the group address.

D-Link DWL-8610AP Specifications

General

2.4 GHz	Yes
Modulation	-
Frequency band	2.4 - 2.497, 4.9 - 5.85 GHz
Number of users	- user(s)
Channels quantity	- channels
Networking standards	IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.3, IEEE 802.3ab, IEEE 802.3at, IEEE 802.3u, IEEE 802.3x
Wi-Fi data rate (max)	1750 Mbit/s
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Maximum data transfer rate	1000 Mbit/s
Flash memory	64 MB
Internal memory	512 MB
Internal	No
Certification	CE, FCC, IC
Product color	Gray
Ethernet LAN (RJ-45) ports	2
Antennas quantity	6
Antenna gain level (max)	6.5 dBi
Power supply type	PoE, DC
Power consumption (typical)	14 W
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 90 %
Package depth	265 mm
Package width	238 mm
Package height	112 mm
Package weight	1160 g
Pallet width	1200 mm
Pallet length	1100 mm
Pallet height (air)	1955 mm
Pallet gross weight (air)	385580 g
Quantity per pallet (air)	210 pc(s)
Shipping (inner) case width	280 mm
Shipping (inner) case height	260 mm
Shipping (inner) case length	585 mm
Shipping (inner) case weight	8740 g
Shipping (inner) case net weight	5800 g
Number of cartons per pallet (air)	42 pc(s)
Quantity per shipping (inner) case	5 pc(s)

Weight and Dimensions

Depth	171 mm
Width	198 mm
Height	40 mm
Weight	240 g