73 Chapter3
TOS Configuration
Set up the TOS priority.
• TOS priority: the system provides 0~63 TOS priority level. Each level has 4 types of priority – high,
middle, low, and lowest. The default value is “Lowest” priority for each level. When the IP packet is
received, the system will check the TOS level value in the IP packet that has received. For example,
user set the TOS level 25 is high. The port 1 is following the TOS priority policy only. When the port 1
packet received, the system will check the TOS value of the received IP packet. If the TOS value of
received IP packet is 25(priority = high), and then the packet priority will have highest priority.
• Click Apply .
IGMP Configuration
The Internet Group Management Protocol (IGMP) is a communications protocol used to manage the
membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent multicast
routers to establish multicast group memberships. It is an integral part of the IP multicast specification,
like ICMP for unicast connections. IGMP can be used for online video and gaming, and allows more
efficient use of resources when supporting these uses.
IGMP have three fundamental types of message as follows:
Table 3.19: IGMP types
Message Description
Query A message sent from the querier (IGMP router or switch) asking for a response from each host
belonging to the multicast group.
Report A message sent by a host to the querier to indicate that the host wants to be or is a member of a
given group indicated in the report message.
Leave Group A message sent by a host to the querier to indicate that the host has quit being a member of a
specific multicast group.
The switch support IP multicast, you can enable IGMP protocol on web management’s switch setting
advanced page, then displays the IGMP snooping information. IP multicast addresses range are from
224.0.0.0 through 239.255.255.255.
• IGMP Protocol: Enable or disable the IGMP protocol.
• IGMP Query: Select the IGMP query function as Enable or Auto to set the switch as a querier for
IGMP version 2 multicast network.
• Click Apply .