Amer Networks SS2R48G4i V2 - Manual (Page 187)

SS2R24G4i/SS2R48G4i
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replace the original higher level DSCP value in the packet; this is also called “marking down”. The
following flowchart describes the operations during policing and remarking
Queuing and scheduling Packets at the egress will re-map the internal DSCP value to CoS value,
the queuing operation assigns packets to appropriate queues of priority according to the CoS value;
while the scheduling operation performs packet forwarding according to the prioritized queue weight.
The following flowchart describes the operations during queuing and scheduling.
22.2 QoS Configuration
22.2.1 QoS Configuration Task List
1． Enable QoS
QoS can be enabled or disabled in Global Mode. QoS must be enabled first in Global Mode to
configure the other QoS commands.
2． Configure class map.
Set up a classification rule according to ACL, VLAN ID, IP Precedence or DSCP to classify the data
stream. Different classes of data streams will be processed with different policies.
3． Configure a policy map.
After data steam classification, a policy map can be created to associate with the class map created
earlier and enter class mode. Then different policies (such as bandwidth limit, priority degrading,
assigning new DSCP value) can be applied to different data streams. You can also define a policy
set that can be use in a policy map by several classes.
4． Apply QoS to the ports
Configure the trust mode for ports or bind policies to ports. A policy will only take effect on a port
when it is bound to that port.
5． Configure queue out method and weight
Configure queue out to PQ or WRR, set the proportion of the 8 egress queues bandwidth and
mapping from internal priority to egress queue.
6． Configure QoS mapping
Configure the mapping from CoS to DSCP, DSCP to CoS, DSCP to DSCP mutation, IP precedence
to DSCP, and policed DSCP.
1．Enable QoS
Command Explanation
Global Mode
mls qos
no mls qos
Enable/disable QoS function.
2．Configure class map.
Command Explanation
Global Mode
class-map <class-map-name> Create a class map and enter class