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596 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
QoS queues
17
QoS behavior on port priority and VLAN priority
in an IronStack
Port priority and VLAN priority have a higher precedence than the 802.1p priority examination. If
port priority is set to 7, all incoming traffic is mapped to internal hardware queue 6.
When stacking is not enabled on a device, all priorities are mapped to their corresponding queues
without restrictions.
QoS behavior for 802.1p marking in an IronStack
By default in stacking mode, 802.1p marking is not enabled. Outgoing tagged traffic is not marked
with 802.1p in the VLAN tag based on the internal hardware queue into which ingress traffic was
classified.
When stacking is disabled on a device, outgoing traffic is marked with 802.1p based on the
internal hardware queue.
QoS queues
Dell PowerConnect devices support the eight QoS queues (qosp0 through qosp7) listed in Table 98.
The queue names listed in Table 98 are the default names. If desired, you can rename the queues
as shown in “Renaming the queues” on page 605.
Packets are classified and assigned to specific queues based on the criteria shown in Figure 112.
Assigning QoS priorities to traffic
By default, all traffic is in the best-effort queue (qosp0) and is honored on tagged ports on all
PowerConnect switches. You can assign traffic to a higher queue based on the following:
• Incoming port (sometimes called the ingress port)
• Static MAC entry
TABLE 98 QoS queues
QoS priority level QoS queue
0 qosp0 (lowest priority queue)
1qosp1
2qosp2
3qosp3
4qosp4
5qosp5
6qosp6
7 qosp7 (highest priority queue)