The Book of PF, 2nd Edition

Setting Up Queues

Now we will look at examples of setting up the three different types of ALTQ queues: priority-based, class-based bandwidth, and HFSC.

The general syntax for ALTQ queues in PF looks like this:

altq on interface type [options ... ] main_queue { sub_q1, sub_q2 ..}
  queue sub_q1 [ options ... ]
  queue sub_q2 [ options ... ] { subA, subB, ... }
[...]
pass [ ... ] queue sub_q1
pass [ ... ] queue sub_q2

Note that cbq and hfsc queues can have several levels of subqueues. The priq queues are essentially flat, with only one queue level. We will address syntax specifics for each type in the following sections.

WHAT IS YOUR TOTAL USABLE BANDWIDTH?

It can be difficult to determine actual usable bandwidth on a specific interface for queuing. If you ...