December 2000 11 - 1
Chapter 11
IronClad Quality of Service (QoS)
This chapter describes how to configure Quality of Service (QoS) on Foundry devices.
NOTE: The IronClad QoS features described in this chapter apply only to Chassis devices and to the
TurboIron/8. To configure QoS on Stackable devices, use the procedures in “Assigning QoS Priorities to Traffic”
on page 11-11. The procedures apply to Chassis devices and Stackable devices. The rest of this chapter applies
only to Chassis devices.
• You can choose between a strict queuing method and a weighted queuing method.
• You can modify the minimum guaranteed percentage of bandwidth for each queue.
• You can apply a QoS profile (one of the four queues) to 802.1q tagged VLAN packets.
• You can display the percentage of an uplink’s bandwidth that each of a given set of ports uses. This is
especially useful in environments where collocated customers on different, isolated ports share common
uplink ports.
These new features add flexibility to the QoS features in earlier software releases but do not replace them.
The Queues
Chassis devices and the TurboIron/8 use the following queues:
• qosp3 – The highest priority queue. This queue corresponds to 802.1p prioritization levels 6 and 7 and
Foundry priority levels 6 and 7.
• qosp2 – The second-highest priority queue. This queue corresponds to 802.1p prioritization levels 4 and 5
and Foundry priority levels 4 and 5.
• qosp1 – The third-highest priority queue. This queue corresponds to 802.1p prioritization levels 2 and 3 and
Foundry priority levels 2 and 3.
• qosp0 – The lowest priority queue. This queue corresponds to 802.1p prioritization levels 0 and 1 and
Foundry priority levels 0 and 1.
The queue names listed above are the default names. You can rename the queues on Chassis devices if you
want, as described in “Renaming the Queues” on page 11-4”.
Stackable devices have two queues:
• High
• Normal
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