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System Configuration
18
ProSafe Plus Switch Utility
MultiCast
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.
You can use either of the following methods to enable or disable IGMP snooping:
• In the IGMP Snooping Status field, select Disable or Enable, and click Apply.
• You can also change the VLAN for which the IGMP Snooping is enabled. In the VLAN ID
Enabled for IGMP Snooping field, enter a valid VLAN ID, and click Apply. This field is
grayed out if VLAN is not enabled.
Validate IGMPv3 IP header
Some network devices might not conform to the IGMPv3 standard. When the Validate IGMPv3
IP header option is enabled, IGMP messages are required to have TTL = 1, ToS Byte = 0xC0
(Internetwork Control), and the router alert IP option (9404) set; otherwise, the packets are
ignored.
Block Unknown MultiCast Address
When enabled, multicast packets are forwarded only to the ports that are in the multicast
group learned from IGMP snooping. All unknown multicast packets are dropped.
IGMP Snooping Static Router Port
You can select a port to be the dedicated IGMP snooping static router port if there is no IGMP
query in the network for the switch to discover the router port dynamically. Once a port is
selected as the static router port, all IGMP Join and Leave reports forward to it. If you select
any in this field, IGMP Join and Leave packets are sent to every port of the switch. Only the
GS105E switch supports the any setting in this field.