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U
P
S
SING THE
OLICY
YSTEM
which it was created). Precedence type and the rules that determine the precedence
between policies in discussed in the next section.
You cannot change the information shown under this tab—the Save and Reset buttons
are disabled.
To change the precedence of a policy, click the Precedence tab and make changes there.
If you think the overlap may be the result of an incorrect policy specification, you can
return to the appropriate tab and make the necessary changes. You can do the same for
any other policy by selecting that policy in the list display at the upper half of the
screen.
T
P
HE
RECEDENCE
This tab lets you assign an "explicit" precedence for a specific policy, within the basic
precedence relationships determined by the QoS implementation type of the policy.
Precedence based on QoS type overrides all other precedence factors. IP QoS gets the
highest priority, Source Port QoS is second, and VLAN QoS is given the lowest priority.
Traffic with higher priority is forwarded by the switch before traffic of lower priority
Thus, Custom and Client-Server policies have higher priority than Source Port policy,
which is in turn higher than a VLAN policy. Since an Application Server policy uses
both IP Qos and Source Port QoS depending on the traffic direction, the precedence of
an Application Server policy will be different based on the direction of the traffic.
If all other precedence variables are equal, and you do not define the precedence
explicitly, then precedence is determined by the time of creation, with the policy created
last having the higher precedence.
Figure 8-19 shows the Precedence tab for a selected policy.
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