Brocade FastIron Ethernet Switch Traffic Management Guide - Manual (Page 22)

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 a traditional stack
By default, 802.1p marking is not enabled in a traditional stack. Outgoing tagged traffic will not be
marked based on the hardware queue into which ingress traffic was classified. 802.1p marking can be
achieved using ACL. For configuration syntax, rules, and examples of QoS marking, refer to the "QoS
options for IP ACLs" section in the FastIron Ethernet Switch Security Configuration Guide .
QoS queues
Brocade devices support the eight QoS queues (qosp0 through qosp7) listed in the following table.
QoS queues TABLE 6
QoS priority level QoS queue
0 qosp0 (lowest priority queue)
1 qosp1
2 qosp2
3 qosp3
4 qosp4
5 qosp5
6 qosp6
7 qosp7 (highest priority queue)
The queue names listed in the table are the default names. If desired, you can rename the queues as
shown in
Renaming the queues on page 39.
Packets are classified and assigned to specific queues based on the criteria shown in the figures
described in the Determining the trust level of a packet section.
For FCX and ICX devices, ingress packets are classified into the eight priorities, which map to eight
hardware queues or traffic classes (TCs) based on the priority. Exceptions to this model are the SX-
FI48GPP and SX-FI-8XG interface modules and the ICX 6430 switch as explained in the following
sections.
Queues for the SX-FI48GPP interface module
The SX-FI48GPP interface module consists of two separate hardware Network Processors (NPs). The
front-end NP supports four hardware queues, and the back-end NP supports eight hardware queues.
Ingress packets are classified into eight priorities mapped into four hardware queues. In the egress,
traffic is destined to two adjacent network ports (for example, ports 1/1 and 1/2), and aggregated into
QoS behavior for 802.1p marking in a traditional stack
20 FastIron Ethernet Switch Traffic Management Guide
53-1003093-03