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Chapter 4: Configuring the High-Level Network

4-44

Quality of Service (QoS) level

Another attribute of a pool is the Quality of Service (QoS) level. The QoS

level is a means by which network equipment can identify and treat traffic

differently based on an identifier. As traffic enters the site, the BIG-IP can

set the QoS level on a packet, based on the QoS level defined in the pool to

which the packet is sent. The BIG-IP can also apply a rule that sends the

traffic to different pools of servers based on the Quality of Service level.

The BIG-IP can tag outbound traffic (the return packets based on an HTTP

GET) based on the QoS value set in the pool. That value is then inspected

by upstream devices and given appropriate priority. Based on a rule, the

BIG-IP can examine incoming traffic to see if it has a particular QoS or ToS

tag in the header. The BIG-IP can then make a rule-based load balancing

decision based on that tag.

Figure 4.13 shows how to configure a pool so that a QoS level is set for a

packet sent to that pool. In this example, the QoS tag, represented by the

link_qos variable, is set to 3 when sending packets to the client, and set to 4

when packets are sent to the server.

Figure 4.13 Example of a pool that sets the QoS level on a packet

In addition to configuring a pool to set the QoS level on a packet, you can

configure a rule that selects a pool based on the existing QoS value within

the packet. For more information, see Quality of Service (QoS) level, on

page 4-53.

Type of Service (ToS) level

Another attribute of a pool is the Type of Service (ToS) level. The ToS

level, also known as the DiffServ value, is a means by which network

equipment can identify and treat traffic differently based on an identifier. As

traffic enters the site, the BIG-IP can set the ToS level on a packet, based on

the ToS level defined in the pool to which the packet is sent. The BIG-IP

can also apply a rule and send the traffic to different pools of servers based

on the ToS level.

The BIG-IP can tag outbound traffic (the return packets based on an HTTP

GET) based on the ToS value set in the pool. That value is then inspected

by upstream devices and given appropriate priority. Based on a rule, the

BIG-IP can examine incoming traffic to see if it has a particular ToS tag in

the header. The BIG-IP can then make a rule-based load balancing decision

based on that tag.

pool http_pool {

link_qos to client 3

link_qos to server 4

}

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