User Manual

Insight Managed 8-Port Gigabit (Hi-Power) PoE+ Smart Cloud Switch with NETGEAR FlexPoE Power
Configure Switching User Manual168
addressed to unrequested group addresses, they cannot 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 receive packets directed to the group address.
In addition to building and maintaining lists of multicast group memberships, the IGMP
snooping switch also maintains a list of multicast routers. Multicast packets are forwarded on
ports to which multicast routers are connected. With IGMP snooping, only one querier can be
active in the network. All other routers in the network are suppressed and are not detectable
by the switch. If a query is not received on an interface within a specified period, the interface
is removed from the list of interfaces to which multicast routers are attached. However, by
default, the multicast router expiration time is zero, that is, the multicast router does not
expire.
A statically configured router that is connected to an interface or VLAN on the switch is
automatically added to the list with learned multicast routers. The interface must be active or
must be both active and a member of the VLAN.
Configure IGMP snooping globally
You can configure the parameters for IGMP snooping, which is used to build forwarding lists
for multicast traffic.
To configure IGMP snooping globally:
1. Connect your computer to the same network as the switch.
You can use a WiFi or wired connection to connect your computer to the network, or
connect directly to a switch that is off-network using an Ethernet cable.
2. Launch a web browser.
3. In the address field of your web browser, enter the IP address of the switch.
For information about finding the IP address of the switch, see Access the switch on
page 14.
The Local Device Login page displays.
If you did not yet register the switch with your NETGEAR account, the Register to unlock
all features page displays. For more information, see
Register and access the switch with
your NETGEAR account on page 29.
4. Enter one of the following passwords:
• After registration, enter your customized local device password.
• If you previously added the switch to an Insight network location, enter the Insight
network password.