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64-3
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 64 Configuring Fabric Congestion Control and QoS
QoS
The FCC information is displayed in the Information pane. The General tab is the default.
Step 2 Select the switch on which you want to enable FCC.
Step 3 Check the Enable check box.
Step 4 Click Apply Changes to save your changes.
Assigning FCC Priority
To assign FCC priority using Fabric Manager, follow these steps:
Step 1 Expand Switches, expand FC Services and then select FCC in the Physical Attributes pane.
The FCC information is displayed in the Information pane. The General tab is the default.
Step 2 Select the switch for which you want to assign the FCC priority.
Step 3 Enter the priority in the Priority column.
Step 4 Click Apply Changes to save your changes.
QoS
QoS implementation in the Cisco MDS 9000 Family follows the differentiated services (DiffServ)
model. The DiffServ standard is defined in RFCs 2474 and 2475.
All switches support the following types of traffic:
• About Control Traffic, page 64-3
• Enabling or Disabling Control Traffic, page 64-4
• About Data Traffic, page 64-4
• VSAN Versus Zone-Based QoS, page 64-5
• Configuring Data Traffic, page 64-6
• About Class Map Creation, page 64-6
• Creating a Class Map, page 64-7
• About Service Policy Definition, page 64-8
• About Service Policy Enforcement, page 64-8
• About the DWRR Traffic Scheduler Queue, page 64-8
• Changing the Weight in a DWRR Queue, page 64-9
About Control Traffic
The Cisco MDS 9000 Family supports QoS for internally and externally generated control traffic. Within
a switch, control traffic is sourced to the supervisor module and is treated as a high priority frame. A
high priority status provides absolute priority over all other traffic and is assigned in the following cases:
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