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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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Basic Concepts of FCoE

Basic Concepts of FCoE

Figure 2-11, FCoE involves the following entities: ENode, FIP, FSB, FCoE Virtual Link, Interface role and FCoE VLAN.

Figure 2-11 FCoE networking
  • ENode

    An ENode is a converged network adapter (CNA) that supports Ethernet and FC. In Figure 2-12, a traditional server has two network adapters installed: network interface card (NIC) connected to a LAN and a host bus adapter (HBA) connected to a SAN. The CNA provides both NIC and HBA functions. It can forward Ethernet data, process FCoE packets, and encapsulate or decapsulate FCoE packets.
    Figure 2-12 Difference between a traditional server and FCoE server
  • FIP

    The FCoE Initialization Protocol (FIP) is a Layer 2 protocol that discovers FC terminals on an FCoE network, implements fabric login, and establishes FCoE virtual links. An ENode can log in to the fabric using FIP to communicate with the target FC device. FIP can also maintain FCoE virtual links.

    For details about FIP, see FIP Protocol.

  • FSB

    A FIP Snooping Bridge (FSB) is a switch running FIP snooping. The FSB itself does not support FC. FIP snooping enables the FSB to obtain FCoE virtual link information by listening on FIP packets. This function is used to control FCoE virtual link setup and prevent malicious attacks.

  • FCoE virtual link

    An FCoE virtual link is a point-to-point logical link between FCoE devices, for example, between an ENode and FCF. The connection between an ENode and FCF is not point-to-point when the ENode and FCF are connected through a lossless Ethernet network. The FCoE virtual link is used to solve this problem.

  • Interface role

    Figure 2-13 Interface roles

    FCoE inherits the interface roles of FC. On an FCoE virtual link between an ENode and an FCF, the ENode interface is a VN_Port and the FCF interface is a VF_Port. On a direct link between the NPV switch and FCF, the interface on the NPV switch is the VNP_Port and the interface on the FCF is the VF_Port.


    As defined by FC-BB-5, FCoE packets are forwarded in specified VLANs. In the FC protocol stack, one FC device supports multiple virtual storage area networks (VSANs), which are similar to Ethernet VLANs. FC traffic in different VSANs is identified by FCoE VLANs during FCoE encapsulation. By doing this, FCoE packets carry only FCoE VLAN information and do not need to carry VSAN information, because VSANs are differentiated by FCoE VLANs.

    • An FCoE virtual link corresponds to one FCoE VLAN.

    • An FCoE VLAN carries only FCoE traffic and does not carry any Ethernet traffic such as IP traffic.

Updated: 2019-05-08

Document ID: EDOC1100004349

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