Dell PowerConnect 5548P System User's Manual page 681

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• If you bind a policy map to more than one port and one of its classes
contains a single policer, all policy map rules will be multiplied per port
(using up more TCAM resources).
• An aggregate policer applies the QoS to all of its flows in aggregation,
regardless of policies and ports.
Advanced QoS settings consist of the following elements:
• Rules — All frames matching a single group of rules are considered to be a
flow.
• Actions — To be applied to frames in each flow that match the rules.
– Policers — See "Single Policers" on page 690
– Aggregate Policers — "Aggregate Policers" on page 688
Trust —"Interface Settings" on page 675, "Policy Class Maps" on
–
page 693
– Set DSCP/CoS — "Policy Class Maps" on page 693
– Set Queue — "DSCP Mapping" on page 681
• Binding — Combination of rules and actions that are bound to one or
more interfaces.
Workflow to Configure Advanced QoS Mode
To configure Advanced QoS mode, perform the following:
1 Select Advanced mode for the system in the QoS Mode page
2 If external DSCP values are different from those used on incoming
packets, map the external values to internal values in the DSCP Rewrite
page.
3 Create ACLs, as described in "Network Security" on page 97.
4 When ACLs are defined, create class maps and associate the ACLs with
them in the Class Mapping pages
5 Create a policy map in the Policy Class Maps pages, and associate the
policy map with one or more class maps. Specify the QoS action, if needed,
for example by assigning a policer to a class map, when you associate the
class map to the policy.
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