Tag: FCOE

[DC] FC / FCoE

FCoE is short for Fibre Channel over Ethernet.

Fibre Channel over Ethernet (FCoE) solves the problem of organizations having to run parallel network infrastructures for their local area networks (LANs) and their storage area networks (SANs). As a result, they have to operate separate switches, host bus adapters (HBAs), network interface cards (NICs) and cables for each of these networks. Even utilizing a virtualization solution like VMware can actually increase the number of network adapters required to carry traffic out of the servers.

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-560403.html

 

  • FIP – FCOE Initialization Protocol
  • FLOGI – Fabric login
  • FcF – FibreChannel Forwarder
  • FSPF – FibreChannel Shortest Path First
FC PortNameDescrption
N_PortNode PortEnd Device
F_PortFabric PortSwitch Port
L_PortLoop PortLoop Topo, End Device
NL_PortNode Loop PortN Port voor arbitrated loop ToPo
FL_PortFabric Loop PortAllows loops to connect to Fabric
E_PortExpansion PortSwitch to Switch connectivity ( ISL )
G_PortGeneric PortAllows auto config on the switch
B_PortBridge PortFC WAN Gateway Port
U_PortUniversal PortAUTO E, F, or FL Port

 

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[DC] Unified Fabric and FCoE

Unified Fabric

  • Traditional DCs
    • LAN and SAN fabric isolation
    • Server has 2 adapters  HBA for SAN and NIC for LAN
    • Kept completely seperate end-to-end
  • Unified Fabric DCs
    • Server 10G ethernet Converged Network Adapters ( CNAs ) for both LAN and SAN ( FCoE )
    • the LAN and SAN traffic is Unified on the same wire providing I/O consolidation

FCoE

 

  • FCoE is a protocol for transporting native FC frames over an 10G ethernet transport link.
  • Full FC frame is encapsulated onto a Jumbo Ethernet Frame.
  • FCoE requires lossless delivery.
  • FCoE requires a seperate FCoE VLAN from a normal VLAN traffic

FCoE Terminology

  • FIP – FCoE Initialisation Protocol
  • FCF – FCoE Forwarder ( switch )
    • accesswitch connected to the initiator
  • Enode ( server)
    • CNA running FCOE
  • Virtual Fibre Channel ( VFC ) Interface
  • Virtual Port Types
    • VN_Port
      • virtual node port
    • VF_Port
      • virtual facbric port
    • VE_Port
      • virtual extension port, switch to switch, multihop

Data Center Bridging

  • Data Center Briding ( DCB ) is a set of IEEE standards for Unified Fabrics
  • Priority Flow Control ( PFC )  ( 802.1Qbb )
    • Lossless delivery for selected CoS
  • Enhanced Traffic Selection ( ETS ) ( 8021.Qaz )
    • Bandwith Management and priority selection
  • These protocols combined: Datacenter Bridging Exchange