CHAPTER
Send documentation comments to mdsfeedback-doc@cisco.com
64-1
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
64
Configuring Fabric Congestion Control and QoS
Fibre Channel Congestion Control (FCC) is a Cisco proprietary flow control mechanism that alleviates
congestion on Fibre Channel networks.
Quality of service (QoS) offers the following advantages:
• Provides relative bandwidth guarantee to application traffic.
• Controls latency experienced by application traffic.
• Prioritizes one application over another (for example, prioritizing transactional traffic over bulk
traffic) through bandwidth and latency differentiation.
This chapter provides details on the QoS and FCC features provided in all switches. It includes the
following sections:
• FCC, page 64-1
• QoS, page 64-3
• Example Configuration, page 64-10
• Ingress Port Rate Limiting, page 64-11
• Default Settings, page 64-12
FCC
FCC reduces the congestion in the fabric without interfering with the standard Fibre Channel protocols.
This section contains the following topics:
• About FCC, page 64-1
• FCC Process, page 64-2
• Enabling FCC, page 64-2
• Assigning FCC Priority, page 64-3
About FCC
The FCC protocol increases the granularity and the scale of congestion control applied to any class of
traffic (see Figure 64-1).
To Next Page
Loading...
Need help?
General
