BLADEOS 6.5.2 Application Guide

Per Hop Behavior

The DSCP value determines the Per Hop Behavior (PHB) of each packet. The PHB is the forwarding treatment given to packets at each hop. QoS policies are built by applying a set of rules to packets, based on the DSCP value, as they hop through the network.

The default settings are based on the following standard PHBs, as defined in the IEEE standards:

￿Expedited Forwarding (EF)—This PHB has the highest egress priority and lowest drop precedence level. EF traffic is forwarded ahead of all other traffic. EF PHB is described in RFC 2598.

￿Assured Forwarding (AF)—This PHB contains four service levels, each with a different drop precedence, as shown below. Routers use drop precedence to determine which packets to discard last when the network becomes congested. AF PHB is described in RFC 2597.

Drop

Class 1

Class 2

Class 3

Class 4

Precedence

 

 

 

 

 

 

 

 

 

Low

AF11 (DSCP 10)

AF21 (DSCP 18)

AF31 (DSCP 26)

AF41 (DSCP 34)

 

 

 

 

 

Medium

AF12 (DSCP 12)

AF22 (DSCP 20)

AF32 (DSCP 28)

AF42 (DSCP 36)

 

 

 

 

 

High

AF13 (DSCP 14)

AF23 (DSCP 22)

AF33 (DSCP 30)

AF43 (DSCP 38)

 

 

 

 

 

￿Class Selector (CS)—This PHB has eight priority classes, with CS7 representing the highest priority, and CS0 representing the lowest priority, as shown below. CS PHB is described in RFC 2474.

Priority

Class Selector

DSCP

 

 

 

Highest

CS7

56

 

 

 

 

CS6

48

 

 

 

 

CS5

40

 

 

 

 

CS4

32

 

 

 

 

CS3

24

 

 

 

 

CS2

16

 

 

 

 

CS1

8

 

 

 

Lowest

CS0

0

 

 

 

138 ￿ Chapter 9: Quality of Service

BMD00220, October 2010

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Blade ICE G8124-E manual Per Hop Behavior, Highest, Lowest
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G8124-E, G8124 specifications

The Blade ICE G8124 is a cutting-edge networking solution designed for high-performance data center environments. It has emerged as a popular choice among organizations that require reliable and efficient network infrastructure to support their growing demands for bandwidth and low-latency connectivity.

One of the key features of the Blade ICE G8124 is its high port density. This networking device typically offers 24 ports of 10 Gigabit Ethernet, ensuring that businesses can connect numerous devices without requiring extensive physical space. The design is also scalable, accommodating future expansion as organizational needs grow.

Another significant aspect of the G8124 is its advanced switching capabilities. It utilizes a non-blocking architecture, enabling simultaneous data transmissions on all ports. This characteristic ensures that there is no bottleneck in the network traffic, providing the high performance needed in data-intensive applications.

The G8124 incorporates various technologies to enhance its functionalities. It supports Layer 2 and Layer 3 switching, making it versatile for different networking needs. Additionally, it features comprehensive Quality of Service (QoS) settings that prioritize critical applications, such as VoIP and video streaming, ensuring smooth operation even under heavy loads.

In terms of security, the Blade ICE G8124 provides robust measures to protect the network. It supports features such as Access Control Lists (ACLs), port security, and VLANs, allowing administrators to segment the network and restrict unauthorized access. These security capabilities are vital in today’s landscape, where cyber threats are increasingly common.

Moreover, the G8124 offers excellent management features. It includes an intuitive user interface for easy configuration and monitoring of network performance. SNMP support allows integration with network management systems, providing administrators with insights needed to optimize their operations.

Power efficiency is also a hallmark of the Blade ICE G8124. It employs energy-saving technologies that reduce operational costs, an essential factor for environmentally-conscious organizations striving to minimize their carbon footprint.

In summary, the Blade ICE G8124 stands out with its high port density, advanced switching capabilities, robust security features, and efficient management options. This networking solution is designed to meet the demands of modern data centers, providing the performance, reliability, and scalability that organizations require. With its innovative technologies, the G8124 ensures that businesses can navigate the complexities of today's networking landscape effectively.
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