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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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FCoE Encapsulation

FCoE Encapsulation

FCoE encapsulates FC frames into Ethernet frames so that FC traffic can be transmitted on an Ethernet network. From the FC perspective, FCoE is a different way of transmitting FC traffic. From the Ethernet perspective, FCoE is just another upper-layer protocol to carry Ethernet frames.

FCoE Protocol Stack

As shown in Figure 2-14, the FC protocol stack is divided into five layers:
  • FC-0: defines the media type.
  • FC-1: defines the frame encoding mode.
  • FC-2: defines the frame format and flow control functions.
  • FC-3: defines universal services.
  • FC-4: defines mapping from the upper-layer protocol to the FC protocol.
Figure 2-14 Mapping from FC to FCoE

As shown in Figure 2-14, FC-0 and FC-1 in the FCoE protocol stack map Physical and MAC layers in IEEE 802.3 Ethernet respectively. The FCoE protocol stack adds an adaptation layer between the upper-layer FC protocol stack and lower-layer Ethernet protocol stack.

FCoE Frame Encapsulation

FCoE encapsulates an FC frame into an Ethernet frame. Figure 2-15 shows FCoE frame encapsulation.

Figure 2-15 FCoE frame encapsulation
  • The Ethernet Header defines the source and destination MAC addresses, Ethernet frame type, and FCoE VLAN. The Ethernet frame type value is FCoE_TYPE (8906h).
  • The FCoE Header specifies the FCoE frame version number and control information.
  • Similar to an FC frame, the FC Header in an FCoE frame carries the source and destination addresses.
Updated: 2019-05-08

Document ID: EDOC1100004349

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