Allied Telesis AT-IFS802SP manual Igmp Configuration, COS Configuration, TOS Configuration

62 AT-IFS802SP-80 User Manual

6.21.3 COS Configuration

Set up the COS priority level.With the drop-down selection item of PriorityType above being selected as COS only/COS first, this control item will then be available to set the queuing policy for each port.

•COS priority: Set up the COS priority level 0~7 - High, Middle, Low, Lowest.

•Click Apply .

6.21.4 TOS Configuration

Set up the TOS priority. With the drop-down selection item of Priority Type above being selected as TOS only/TOS first, this control item will then be available to set the queuing policy for each port.

•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, the user sets the TOS level 25 as high, 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 to have the configuration take effect..

6.22IGMP Configuration

The Internet Group Management Protocol (IGMP) is an internal protocol of the Internet Protocol (IP) suite. IP manages multicast traffic by using switches, routers, and hosts that support IGMP. Enabling IGMP allows the ports to detect IGMP queries, report packets, and manage IP multicast traffic through the switch. IGMP have three fundamental types of message shown as follows:

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.