The classifier number indicates precedence. The classifier with the lowest
number takes precedence if a packet meets the criteria for more than one
classifier.
For example, you might use two classifiers as follows:
With these classifiers in place, if 3.3.3.3 sends TCP traffic, this traffic
receives low priority, since classifier number 6 is lower than classifier 420
and has a higher precedence. Table 60 shows the basic information for
these classifiers.
Table 60 Classifier Number Precedence for Two Classifiers
Classifier
6
(user-defined)
420
(predefined)
You can define up to 100 flow classifiers per system for routed IP traffic.
Defining Flow
Classifiers
When you define a flow classifier (using a unique classifier number), you
can create one or more address/port patterns (filters) for that classifier.
Each address/port pattern counts toward the flow classifier limit.
Therefore, if you define a flow classifier with 10 address/port patterns,
you can have up to 90 additional flow classifiers.
Because a flow classifier handles IP routed traffic only, it is expected that
you have an IP VLAN, an IP routing interface, and IP routing enabled.
You define a flow classifier with classifier number 6 that recognizes all
TCP or UDP traffic from IP address 3.3.3.3. The control you assign to
this classifier (control 5) gives this traffic a low priority service level.
You use the predefined nonflow classifier 420, which recognizes all
TCP traffic, and create a control for this classifier to give the TCP traffic
a high priority service level. (By default, this classifier has no control.)
Name
from_3.3.3.3 5
TCP/IP
Control
Cast
UM
(for low priority)
6
U
(for high priority)
QoS Classifiers
485
Protocol
802.1p
all (TCP,
–
UDP)
TCP/IP
0-7