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6. Create an input policy map.
CONFIGURATION mode
Dell(conf)#policy-map-input pp_policmap
7. Create a service queue to associate the class map and QoS policy map.
POLICY-MAP mode
Dell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policy
pp_qospolicy
Ordering ACL Rules
When you link class-maps to queues using the service-queue command, the system matches the
class-maps according to queue priority (queue numbers closer to 0 have lower priorities).
For example, as described in the previous example, class-map cmap2 is matched against ingress packets
before
cmap1.
ACLs acl1 and acl2 have overlapping rules because the address range 20.1.1.0/24 is within 20.0.0.0/8.
Therefore (without the keyword order), packets within the range 20.1.1.0/24 match positive against
cmap1 and are buffered in queue 7, although you intended for these packets to match positive against
cmap2 and be buffered in queue 4.
When class-maps with overlapping ACL rules are applied to different queues, use the keyword order to
process ACL rules in the desired order. ACL rules with lower order numbers (order numbers closer to 0)
are applied before rules with higher order numbers so that packets are matched as you intended.
• Specify the order in which you want to apply ACL rules using the keyword order.
order
The order can range from 0 to 254.
By default, all ACL rules have an order of 254.
Displaying Configured Class Maps and Match Criteria
To display all class-maps or a specific class map, use the following command.
Dell Networking OS Behavior: An explicit “deny any" rule in a Layer 3 ACL used in a (match any or match
all) class-map creates a "default to Queue 0" entry in the CAM, which causes unintended traffic
classification. In the following example, traffic is classified in two Queues, 1 and 2. Class-map ClassAF1 is
“match any,” and ClassAF2 is “match all”.
• Display all class-maps or a specific class map.
EXEC Privilege mode
show qos class-map
Examples of Traffic Classifications
The following example shows incorrect traffic classifications.
Dell#show running-config policy-map-input
!
policy-map-input PolicyMapIn
service-queue 1 class-map ClassAF1 qos-policy QosPolicyIn-1
service-queue 2 class-map ClassAF2 qos-policy QosPolicyIn-2
Dell#show running-config class-map
!
726
Quality of Service (QoS)