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Thread: What is Fibre Channel over Ethernet (FCoE)

  1. #1
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    Feb 2011
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    What is Fibre Channel over Ethernet (FCoE)

    I have newly registered on this site. Actually I was searching for the content related to the FCoE on web (Google), and I found some information about it on your site. So, I thought to register here and ask this question to you all. Please tell me what is Fibre Channel over Ethernet (FCoE)? Also I want to know about the Converged Enhanced Ethernet (CEE) which is related to same topic. Hope that you will provide some help soon.

  2. #2
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    Apr 2010
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    Re: What is Fibre Channel over Ethernet (FCoE)

    FCoE is based on the mechanisms now exactly. More importance is the establishment of an Ethernet frame, the FCoE transported. First, FCoE is directly based on Ethernet and is thus completely independent of IP. IPv4 is the EtherType 0x0800, IPv6 by 0x86dd FCoE and now just announced by a separate EtherType in the Ethernet header: 0x8906. Secondly, the payload, ie (FCoE is in the FC, in the normally SCSI contagious!), Greater than 1500 bytes. The consequence is that any support FCoE implementation Jumbo frames of at least about 2300 bytes for MTU size needs. To make the above-mentioned PFC function must be an FCoE adapter (CNA = Converged / Consolidated Network Adapter) the frame of a host always an IEEE 802.1Q VLAN tag for the journey. When a normal FC-node first contact with its FC- Switch takes to find some basic protocol rituals take place, host, and then switch with the capacity which, FC infrastructure (FC-Fabric) to use. These include for example the Fabric Login (FLOGI) for allocating a logical FC address (FCID) of FC-node through the switch.

  3. #3
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    Re: What is Fibre Channel over Ethernet (FCoE)

    The FC-BB-5 standard defines eNodes (FCoE Nodes) and FCFS (FCoE Forwarder) as the two-party Fibre Channel, the FC you are able now to talk about Ethernet. ENodes are realized in CNAs and FCF in accordance with FCoE-aware switches. Here, playing a record of the trial a special role, the FIP (FCoE Initialization Protocol, EtherType 0x8914). Before it can come to an FCoE communications must first be clarified by FIP, with which MAC address of the eNode future communication, as these are the burned-in MAC address is different (BIA) of the CNA. In this context, the essential process for FC FLOGI of FIP is realized. In fact, the address that will bear the eNode in the SAN (the FCID), part of its MAC address for the same frames as long as they still flow in the CEE region. This mapping between the logical address in the SAN and MAC address on the LAN is called FPMA (Fabric Provided MAC Address).

  4. #4
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    Re: What is Fibre Channel over Ethernet (FCoE)

    FIP has done its duty first to run all of the following communications from FC-FC in accordance with the standards. That is, while the FC data in Ethernet frames are encapsulated, it sends the eNode with FPMA as the source and the MAC address of the FCF as a destination address. The FCF receives this frame, according to current implementations of the FCoE header and sends the frame as a pure FC-frame directly to the SAN. Normal (IP) traffic is sent from the host, however the CNA with the BIA and not end up in the FCF function of the switch.

  5. #5
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    Re: What is Fibre Channel over Ethernet (FCoE)

    Specifically, in CEE following procedure are provided :
    • Priority-based Flow Control (PFC, IEEE 802.1Qbb + 802.3bd)
    • Enhanced Transmission Selection (ETS, IEEE 802.1Qaz)
    • Data Center Bridging Exchange Protocol (DCBX) and
    • Congestion Notification (CN, IEEE 802.1Qau).
    PFC defines the 802.1p Class of Service (CoS =) differential use of the PAUSE function between two Ethernet nodes. The pause-based flow control has been around a long time in Ethernet (IEEE 802.3x), but the one usually turned off and the other does not differentiate between different traffic classes. PFC requires a CEE-compatible interface (from end devices as well as of switches) that according to the known QoS standard of the OSI layer 2, IEEE 802.1p, must be to differentiate eight different traffic classes, as evidenced by a mark in the VLAN field takes the Ethernet frame. PAUSE will be class specific to the achievement of certain thresholds reported back to the transmitter so that the traffic of this class, such as FC traffic is not forwarded to avoid possible losses on the receiving end.

  6. #6
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    Re: What is Fibre Channel over Ethernet (FCoE)

    The consolidated OSI Layer 2 (ie, Ethernet) networks of the future a lot of different traffic classes will compete for bandwidth. ETS describes the exact mechanisms, such as the various traffic classes can be attributed to interface to a different amount of bandwidth, on the other, but also must always be possible that unused bandwidth can be shared under certain classes for short bursts. Although PFC and ETS already define important principles to avoid losses in Ethernet environments, it requires further action to Ethernet to pave the way for a consolidated future. While care PFC and ETS are the events on and around a link that defines the congestion notification for an explicit feedback mechanism via the link out to the original sender of the congestion-causing data flow, with the motto: "Eliminate the problem at its root". The last, but central part of the CEE definitions is the requirement for a clearly definable data-center bridging domain are mentioned. Their boundaries with respect to the "normal" by a DCBX Ethernet protocol. With the help of this particular protocol are also explored and the capabilities of the neighbors and possible interactions. Based on this new protocol will be the already standardized LLDP (Link Layer Discovery Protocol, IEEE 802.1ab).

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