Configuring Wfq; Overview; Conversations - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Setting Up Quality of Service

Configuring WFQ

7-14
Configuring WFQ

Overview

WFQ is one method for granting differentiated service to various types of
traffic. It classifies traffic according to the source and destination IP addresses
and protocol port, and allocates traffic bandwidth relative to IP precedence
value. WFQ is best suited for granting high-priority traffic greater bandwidth.
Because WFQ still queues all traffic, it is not best for VoIP and other real-time
traffic that cannot tolerate delays.

Conversations

The outbound traffic on a point-to-point connection is the traffic flow. It
consists of a queue of packets waiting for service. A router implementing WFQ
classifies the traffic flow into several conversations. The router defines each
conversation by creating a hash of the source or destination IP address, port
number, and protocol type in packets' IP headers; all packets with the same
hash value are in the same conversation.
LAN 1
Router
LAN 2
Figure 7-3. Weighted Fair Queuing
Using WFQ, the router then creates a number of individual subqueues, one for
each flow or conversation (see Figure 7-3). The ProCurve Secure Router
supports up to 256 conversation subqueues.
B A
Subqueue A = LAN 1 LAN 3 (high priority)
Subqueue B = LAN 2 LAN 3
Router
LAN 3