7.8.1.0 - Force10 Networks

In cases such as these, where class-maps with overlapping ACL rules are applied to different queues, use
the order keyword to specify the order in which you want to apply ACL rules, as shown in Figure 423. The
order can range from 0 to 254. FTOS writes to the CAM ACL rules with lower order numbers (order
numbers closer to 0) before rules with higher order numbers so that packets are matched as you intended.
By default, all ACL rules have an order of 254.
Set DSCP values for egress packets based on flow
Match-any Layer 3 flows may have several match criteria. All flows that that match at least one of the
match criteria are mapped to the same queue since they are in the same class map. Setting a DSCP value
from QOS-POLICY-IN mode (see Set a DSCP value for egress packets on page 631) assigns the same
DSCP value to all of the matching flows in the class-map. The Flow-based DSCP Marking feature allows
you to assign different DSCP to each match criteria CLASS-MAP mode using the option set-ip-dscp with
the match command so that matching flows within a class map can have different DSCP values, as shown
in Figure 424. The values you set from CLASS-MAP mode override the value you QoS input policy DSCP
value, and packets matching the rule are marked with the specified value.
Figure 424 Marking Flows in the Same Queue with Different DSCP Values
Force10#show run class-map
!
class-map match-any example-flowbased-dscp
match ip access-group test set-ip-dscp 2
match ip access-group test1 set-ip-dscp 4
match ip precedence 7 set-ip-dscp 1
Force10#show run qos-policy-input
!
qos-policy-input flowbased
set ip-dscp 3
Force10# show cam layer3 linecard 2 port-set 0
Cam Port Dscp Proto Tcp Src Dst SrcIp DstIp DSCP Queue
Index Flag Port Port Marking
-------------------------------------------------------------------------------------------
-----
16260 1 0 TCP 0x0 0 0 1.1.1.0/24 0.0.0.0/0 2 0
16261 1 0 UDP 0x0 0 0 2.2.2.2/32 0.0.0.0/0 4 0
16262 1 56 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 1 0
Display configured class maps and match criteria
Display all class-maps or a specific class map using the command show qos class-map from EXEC
Privilege mode.
628 Quality of Service