HP Network Direr Software Products manual DiffServ Codepoints, Service Level DiffServ Codepoint

630CHAPTER 15: PRIORITIZING NETWORK TRAFFIC

Service levels enable easy identification of end-to-end treatment of traffic. If the example was to be configured appropriately on the devices throughout the network, it would be possible to say that database traffic is treated as business critical throughout the network.

Settings within a service level may vary from device to device depending upon the device’s capabilities. One device, for example, may have four queues whilst another device may have two. As a result, a particular service level on one device may put the traffic in queue 3 while on another device it may be queue 1. However, identifying the service levels by name simplifies the understanding of the configuration.

Configuring the When some devices in a network are complex classification devices and Network for other devices are simple classification devices, it is necessary to apply

End-to-end Traffic configurations in such a way that the markings applied by the complex Prioritization classification devices are treated appropriately by the simple classification

devices.

In the previous example it was possible to specify that each service level marked its traffic with a DiffServ codepoint, assuming that the device in question was a complex classification device. The DiffServ codepoints can be seen in Table 99.

Table 99 DiffServ Codepoints

Service Level	DiffServ Codepoint
Business Critical Service Level	16
CEO’s Service Level	24
Voice Service Level	46
All Other Traffic Service Level	0

The DiffServ codepoints chosen in the table above are taken from the recommended values from RFC2474 and RFC3246.

The Blocked Service Level does not require a DiffServ codepoint value as the traffic is dropped anyway which makes marking the traffic unnecessary.

In order for devices to be able to provide suitable prioritization when they are not capable of identifying the types of traffic, it is possible to configure the devices to identify the traffic by their DiffServ codepoint.