Chapter 20: Quality of Service (QoS) Commands
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create qos policy=17 description=”video flow”
trafficclasslist=19 ingressport=1
Policy 32 Commands:
create classifier=42 description=”video flow”
ipdadddr=149.44.44.44
create qos flowgroup=36 description=”video flow”
priority=4 classifierlist=42
create qos trafficclass=21 description=”video
flow” maxbandwidth=5 flowgrouplist=36
create qos policy=32 description=”video flow”
trafficclasslist=21 ingressport=8
The parts of the policies are:
❑Classifiers - Specify the IP address of the node with a video
application. The classifier for Policy 17 specifies the address as a
source address since this classifier is part of a policy concerning
packets sent by the application. The classifier for Policy 32
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 4 for the packets. As
with the previous example, the packets leave the switch with the
same priority level they had when they entered. The new priority
level is relevant only while the packets traverse the switch. To alter
the packets so that they leave containing the new level, you
would change option 5, Remark Priority, to Yes.
❑Traffic Classes - Specify a maximum bandwidth of 5 Mbps for the
packet stream. Bandwidth assignment can only be made at the
traffic class level.
❑Policies - Specify the traffic class and the port where the policy is
to be assigned.
Example 3: Critical Database
Critical databases typically require a high bandwidth. They also typically
require less priority than either voice or video.
The policies in this example assign 50 Mbps bandwidth, with no change
to priority, to traffic going to and from a database. The database is
located on a node with the IP address 149.44.44.44 on port 1 of the
switch.