QoS and QoS Policies
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Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
3.1 QoS Overview
This section contains the following overview topics related to QoS:
• Overview
• Egress and Ingress Traffic Direction
• Forwarding Classes
• Scheduling Modes
• Intelligent Discards
• Buffering
• Per-SAP Aggregate Shapers (H-QoS) On Gen-2 Hardware
• Per-VLAN Network Egress Shapers
• Per-Customer Aggregate Shapers (Multiservice Site) on Gen-2 Hardware
• QoS for Hybrid Ports on Gen-2 Hardware
• QoS for Gen-3 Adapter Cards and Platforms
• QoS on a Ring Adapter Card or Module
• QoS for IPSec Traffic
• QoS for Network Group Encryption Traffic
3.1.1 Overview
In order to provide what network engineers call Quality of Service (QoS), the flow of
data in the form of packets must be predetermined and resources must be somehow
assured for that predetermined flow. Simple routing does not provide a
predetermined path for the traffic, and priorities that are described by Class of
Service (CoS) coding simply increase the odds of successful transit for one packet
over another. There is still no guarantee of service quality. The guarantee of service
quality is what distinguishes QoS from CoS. CoS is an element of overall QoS.
By using the traffic management features of the 7705 SAR, network engineers can
achieve a QoS for their customers. Multiprotocol Label Switching (MPLS) provides a
predetermined path, while policing, shaping, scheduling, and marking features
ensure that traffic flows in a predetermined and predictable manner.
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