Allied Telesis AT-8100S/24C Guide de l'utilisateur Page 270

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Chapter 22: Quality of Service (QoS)
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DSCP action causes a port to change the DSCP value of all ingress
packets that match the filtering criteria with the specified DSCP value.
The mark CoS action causes a port to change the CoS value of all
ingress packets that match the filtering criteria with the specified Cos
value.
A port can have only one QoS policy.
A QoS policy can be assigned to more than one port.
QoS classifies ingress packets, but does not process egress packets.
As a result, you must apply QoS policies to the ingress ports of the
designated traffic flows.
QoS policies for static port trunks or LACP trunks must be assigned to
the individual ports of the trunks.
A QoS policy can have multiple filtering criteria. For example, a QoS
may classify traffic based on a source IP address, a VLAN ID, and a
DSCP value.
A QoS policy that has more than one filtering criterion selects traffic
that matches all specified filtering criteria.
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