680 Dell PowerConnect 55xx Systems User GuideFILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\DellContax\sources\CxUGQoS.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 1 0 / 3 0 / 1 3 - F O R P R O O F O N LY• If you bind a policy map to more than one port and one of its classescontains 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 aflow.• 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" onpage 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 ormore interfaces.Workflow to Configure Advanced QoS ModeTo 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 incomingpackets, map the external values to internal values in the DSCP Rewritepage.3 Create ACLs, as described in "Network Security" on page 97.4 When ACLs are defined, create class maps and associate the ACLs withthem in the Class Mapping pages.5 Create a policy map in the Policy Class Maps pages, and associate thepolicy 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 theclass map to the policy.
