Allied Telesis AT-IFS802SP Switch User Manual


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62 AT-IFS802SP/POE(W)-80 User Manual
Set up the COS priority level. With the drop-down selection item of Priority Type above being
selectedasCOSonly/COSrst,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 .•
6.21.3COSConguration
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Set up the TOS priority. With the drop-down selection item of Priority Type above being
selectedasTOSonly/TOSrst,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tohavethecongurationtakeeffect..•
6.21.4TOSConguration
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6.22IGMPConguration
The Internet Group Management Protocol (IGMP) is an internal protocol of the Internet Protocol
(IP)suite.IPmanagesmulticasttrafcbyusingswitches,routers,andhoststhatsupportIGMP.Enabling
IGMPallowstheportstodetectIGMPqueries,reportpackets,andmanageIPmulticasttrafc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specicmulticastgroup.
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