BLADE OS™ Application Guide HP GbE2c Ethernet Blade Switch for c-Class BladeSystem Version 5.1 Advanced Functionality Software
Table Of Contents
- Contents
- Figures
- Tables
- Preface
- Part 1: Basic Switching
- Accessing the Switch
- The Management Network
- Local Management Using the Console Port
- The Command Line Interface
- Remote Management Access
- Client IP Address Agents
- Securing Access to the Switch
- Setting Allowable Source IP Address Ranges
- RADIUS Authentication and Authorization
- TACACS+ Authentication
- LDAP Authentication and Authorization
- Secure Shell and Secure Copy
- Configuring SSH/SCP Features on the Switch
- Configuring the SCP Administrator Password
- Using SSH and SCP Client Commands
- SSH and SCP Encryption of Management Messages
- Generating RSA Host and Server Keys for SSH Access
- SSH/SCP Integration with Radius Authentication
- SSH/SCP Integration with TACACS+ Authentication
- End User Access Control
- Ports and Trunking
- Port-Based Network Access Control
- VLANs
- Spanning Tree Protocol
- RSTP and MSTP
- Link Layer Discovery Protocol
- Quality of Service
- Accessing the Switch
- Part 2: IP Routing
- Basic IP Routing
- Routing Information Protocol
- IGMP
- OSPF
- OSPF Overview
- OSPF Implementation in BLADE OS
- OSPF Configuration Examples
- Remote Monitoring
- Part 3: High Availability Fundamentals
- High Availability
- Layer 2 Failover
- Server Link Failure Detection
- VRRP Overview
- Failover Methods
- BLADE OS Extensions to VRRP
- Virtual Router Deployment Considerations
- High Availability Configurations
- High Availability
- Part 4: Appendices
- Index
BLADE OS 5.1 Application Guide
BMD00113, September 2009 Chapter 8: Quality of Service 149
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 GbE2c 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 prece-
dence 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 dis-
card last when the network becomes congested. AF PHB is described in RFC 2597.
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.
Drop
Precedence
Class 1 Class 2 Class 3 Class 4
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)
Priority Class Selector DSCP
Highest CS7 56
CS6 48
CS5 40
CS4 32
CS3 24
CS2 16
CS1 8
Lowest CS0 0