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Configuration Guide - DCN and Server Management

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of Trill, FCoE, DCB, and NLB Server Cluster Association.
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Overview of FCoE

Overview of FCoE

Data Center Network Convergence Trend

As shown in Figure 2-1, the local area network (LAN) and storage area network (SAN) of a traditional data center are deployed and maintained independently. The LAN transmits services between servers and between servers and clients, and the SAN transmits services between servers and storage devices.

As data centers develop rapidly and increasing servers are deployed, independent deployment of LANs and SANs results in the following problems:
  • Complex network: Service deployment is inflexible, network expansion is difficult, and network maintenance and management costs are high.

  • Low energy efficiency: Each server is configured with at least four to six network adapters, including network interface cards (NICs) connected to the LAN and host bus adapters (HBAs) connected to the SAN. Such settings increase power consumption and cooling costs.

Figure 2-1 Before and after data center network convergence

After the LAN and SAN are converged, the SAN and Ethernet LAN share the same integrated network infrastructure, simplifying network infrastructure.

Fiber Channel over Ethernet (FCoE) is used for network convergence.


FCoE is a network convergence technology defined by the American National Standards Institute (ANSI). It is also an I/O consolidation solution based on the FC protocol.


After the LAN and SAN are converged, the following issues occur:
  • FC traffic cannot be forwarded over Ethernet.
  • Unlike the FC network, Ethernet cannot ensure lossless forwarding.
FCoE and Data Center Bridging (DCB) address these issues.
  • FCoE encapsulates FC frames into Ethernet frames to enable the convergence of the LAN and SAN, allowing them to share network resources.
  • DCB builds lossless Ethernet networks on data center networks. It enables traditional Ethernet to implement congestion control comparable to that on FC SANs, and provides QoS guarantee for FCoE services.


FCoE brings the following benefits:

  • Reduces Total Cost of Ownership (TCO): FCoE integrates and fully uses distributed resources, allowing LANs and SANs to share network resources. It reduces investments on SAN network infrastructure, simplifies the network topology, and reduces network management and maintenance costs. In addition, servers use converged network adapters (CNAs), which reduce electricity and cooling costs in data centers.
  • Saves investment: FCoE seamlessly integrates existing Ethernet and FC infrastructure on data center networks to maximize the return on investment on FC SAN infrastructure, including various FC SAN tools, and established FC SAN facilities and management architecture.
  • Enhances service flexibility: FCoE provides capabilities for all servers to access storage devices and allows virtual machine (VM) migrations. This implementation improves system flexibility and availability.
Updated: 2019-05-08

Document ID: EDOC1100004349

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