User's Manual

Virtual Connect networks 104
or traffic shaping for Ethernet traffic flows. FCoE traffic is prioritized and classified in FlexFabric modules but
controls were fixed and not exposed to administrators.
The diagram below illustrates a pass-through configuration where packets are transmitted in the same order
as they are received.
The QoS feature introduced in VC 4.01 allows administrators to configure traffic queues for different priority
network traffic, categorize and prioritize ingress traffic and adjust DOT1P priority settings on egress traffic.
Administrators can use these settings to ensure that important traffic receives the highest priority handling
while less important traffic is handled at a lower priority.
The default QoS configuration in VC 4.01 is pass-through. Two other configuration types for "Custom (with
FCoE Lossless) (on page 105)" and "Custom (without FCoE Lossless) (on page 108)" provide administrators
with basic settings that can be further tuned depending on whether FCoE traffic is present in the Virtual
Connect environment.
Quality of Service screen
The Quality of Service (on page 103) feature allows users to prioritize network traffic to enhance
performance.
To access this screen, do one of the following:
• Under Ethernet in the left navigation tree, click Quality of Service (QoS).
• On the home page, in the Network section, click Quality of Service (QoS).
• On the home page, click Configure, and then select Quality of Service (QoS).