In An Ironstack; Qos Behavior For 802.1P Marking In An Ironstack; Qos Queues; Assigning Qos Priorities To Traffic - Dell PowerConnect B-FCXs Configuration Manual

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QoS queues

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
QoS priority level
0
1
2
3
4
5
6
7
The queue names listed in
as shown in
Packets are classified and assigned to specific queues based on the criteria shown in

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:
•
•
596
QoS queues
QoS queue
qosp0 (lowest priority queue)
qosp1
qosp2
qosp3
qosp4
qosp5
qosp6
qosp7 (highest priority queue)
Table 98
"Renaming the queues"
Incoming port (sometimes called the ingress port)
Static MAC entry
are the default names. If desired, you can rename the queues
on page 605.
PowerConnect B-Series FCX Configuration Guide
Table 98.
Figure 112.
53-1002266-01