Dell X1000 Networking X-Series Switches User Guide - Page 234

Rules, Actions

Page 234 highlights

FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\User Guide\Dell_Astute_Network_Admin_QoS.fm • Policy Class Maps • Policy Binding Overview The switch uses policies to support per-flow QoS. A policy and its components have the following characteristics and relationships: • A policy contains one or more class maps. • A class map defines a flow with one or more associated ACLs. Packets that match the ACL rules (ACEs) in a class map with Permit (forward) action, belong to the same flow, and are subject to the same quality of service action. A policy can contain one or more flows, each with a user-defined QoS action. • The QoS of a class map (flow) may be enforced by the associated policer. There are two type of policers, as described in "Policers " on page 237. • Per-flow QoS actions are applied to flows by binding the policy maps to the desired ports. A policy map and its class maps can be bound to one or more ports, but each port is bound with, at the most, one policy map. The following points should be considered: • An ACL can be configured to one or more class maps, regardless of policies. • A class map can belong to only one policy map. • When a class map, using a single policer, is bound to multiple ports, each port has its own instance of the policer. Each instance applies the QoS actions on the class map (flow) at a port independent of each other. • 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. 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. DELL CONFIDENTIAL - PRELIMINARY 8/9/16 - FOR PROOF ONLY 234 Network Administration: Quality of Service

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234
Network Administration: Quality of Service
FILE LOCATION:
C:\Users\gina\Desktop\Checkout_new\Dell Astute\User
Guide\Dell_Astute_Network_Admin_QoS.fm
DELL CONFIDENTIAL – PRELIMINARY 8/9/16 - FOR PROOF ONLY
Policy Class Maps
Policy Binding
Overview
The switch uses policies to support per-flow QoS. A policy and its components
have the following characteristics and relationships:
A policy contains one or more class maps.
A class map defines a flow with one or more associated ACLs. Packets that
match the ACL rules (ACEs) in a class map with Permit (forward) action,
belong to the same flow, and are subject to the same quality of service
action. A policy can contain one or more flows, each with a user-defined
QoS action.
The QoS of a class map (flow) may be enforced by the associated policer.
There are two type of policers, as described in "Policers " on page 237.
Per-flow QoS actions are applied to flows by binding the policy maps to the
desired ports. A policy map and its class maps can be bound to one or more
ports, but each port is bound with, at the most, one policy map.
The following points should be considered:
An ACL can be configured to one or more class maps, regardless of
policies.
A class map can belong to only one policy map.
When a class map, using a single policer, is bound to multiple ports, each
port has its own instance of the policer. Each instance applies the QoS
actions on the class map (flow) at a port independent of each other.
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.
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.