AT-S62 Command Line User’s Guide
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of a policy concerning packets coming from the application. The
classifier for Policy 11 specifies the address as a destination
address since this classifier is part of a policy concerning packets
going to the application.
❑Flow Groups - Specify the new priority level of 7 for the packets. It
should be noted that in this example the packets leave the switch
with the same priority level they had when they entered. The new
priority level is relevant only as the packets traverse the switch. To
alter the packets so that they leave containing the new level, you
would use the REMARKPRIORITY option in the CREATE QOS
FLOWGROUP command.
❑Traffic Classes - No action is taken by the traffic classes, other than
to specify the flow groups. Traffic class has a priority setting that
can be used to override the priority level of packets, just as in a
flow group. If you enter a priority value both in the flow group and
the traffic class, the value in the flow group overrides the value in
the traffic class.
❑Policies - Specify the traffic class and the port to which the policy
is to be assigned. Policy 6 is applied to port 1 since this is where
the application is located. Policy 11 is applied to port 8 since this
is where traffic going to the application will be received on the
switch.
Example 2: Video Application
Video applications typically require a larger bandwidth than voice
applications. Video applications can be set up to have a high priority and
buffering, depending on the application.
This example creates policies with low latency and jitter for video
streams (for example, net conference calls). The policies assign the
packets a priority level of 4 and limit the bandwidth to 5 Mbps. The node
containing the application has the IP address 149.44.44.44. Policy 17 is
assigned to port 1, where the application is located, and Policy 32 is
assigned to port 8 where packets destined to the application enter the
switch.
Policy 17 Commands:
create classifier=16 description=”video flow”
ipsadddr=149.44.44.44
create qos flowgroup=41 description=”video flow”
priority=4 classifierlist=16
create qos trafficclass=19 description=”video
flow” maxbandwidth=5 flowgrouplist=41