FCOE 技術詳解ppt課件

1、FCoE:Fibre Channel over Ethernet,1,Internet,Current Data Center Structure,IPC,FC SAN B,FC SAN A,LAN,Hosts,Storage devices,2,Internet,Consolidated Data Center Structure,Storage IPC LAN,Hosts,Storage devices,3,Internet,Pragmatic Consolidated Data Center Structure,FC SAN B,FC SAN A,LAN,Storage IPC LAN,

2、Hosts,Storage devices,4,Fewer CNAs (Converged Network Adapters) instead of NICs, HBAs and HCAs Less power consumption,I/O Consolidation in the Host,5,Ethernet based Lot of investment in data centers More bandwidth To consolidate existing interfaces PCI Express solves the bandwidth bottleneck in serv

3、er buses to support 10G interfaces 10GE is the best candidate for I/O consolidation High bandwidth Full duplex links Competitive cost Optical interface cost dramatically reduced by SFP+ modules Twinax cable in alternative to Cat5e/6/6a cables as low cost electric interface,I/O Consolidation Requirem

4、ents,10GE SFP+,6,Ethernet may be extended to become lossless: Collisions do not exist in full duplex links The only ones deployed in data centers Link errors are rare in data centers They are present also in native Fibre Channel Congestion can be dealt with extensions Pause-based Flow Control Priori

5、ty-based Flow Control Lossless Ethernet allows a direct mapping of Fibre Channel over Ethernet (FCoE),Lossless Ethernet,7,Also called Per-Priority Pause (PPP) PAUSE functionality per Ethernet priority IEEE 802.1Q defines 8 priorities Traffic classes are mapped to different priorities: no traffic int

6、erference Storage traffic may be paused while IP traffic is being forwarded Or, vice versa Requires independent resources per priority (buffers) High level of industry support Cisco distributed proposal Standard Track in IEEE 802.1Qbb,Priority-based Flow Control (PFC),8,PRIORITY-BASED FLOW CONTROL,9

7、,FCoE is I/O consolidation of FC storage traffic over Ethernet FC traffic shares Ethernet links with other traffics Requires a lossless Ethernet fabric,FCoE: FC over Ethernet,10,1, 10 . . . Gbps,From a Fibre Channel standpoint its FC connectivity over a new type of cable called an Ethernet cloud Fro

8、m an Ethernet standpoints its yet another ULP (Upper Layer Protocol) to be transported,FCoE Protocol Stack,11,FCoE benefits are the same of any I/O consolidation solution Fewer Cables Both block I/O & Ethernet traffic co-exist on same cable Fewer adapters needed Overall less power Plus additional ad

9、vantages of being FC Seamless integration with existing FC SANs No Gateway,FCoE Benefits,12,FCoE Benefits,13,FCoE is Fibre Channel,FCoE is Fibre Channel at the host and switch level,Same Operational Model,Same Techniques ofTraffic Management,Same Managementand Security Models,Easy to Understand,Comp

10、letely based on the FC model,Same host-to-switch and switch-to-switch behavior of FC,E.g., in order delivery or FSPF load balancing,WWNs, FC-IDs, hard/soft zoning, DNS, RSCN,Aligned with the FC-BB-4 Model,Standardizedin FC-BB-5,14,Stateful gateway issues: Single point of failure Limited scalability,

11、Gateway-less FCoE,iSCSI Initiator,iSCSI gateway,Ethernet,FC Target,stateful,15,FCoE itself Is the data plane protocol It is used to carry most of the FC frames and all the SCSI traffic,FIP (FCoE Initialization Protocol) It is the control plane protocol It is used to discover the FC entities connecte

12、d to an Ethernet cloud It is also used to login to and logout from the FC fabric,Protocol Organization,FCoE is really two different protocols:,16,FCoE frame size,17,FCoE Frame Format,18,ENode(FCoE Node): a Fibre Channel HBA implemented within an Ethernet NIC aka CNA (Converged Network Adapter),ENode

13、: Simplified Model,Enetport,Enetport,FC Node,FCoE,FCoE,19,FCF (Fibre Channel Forwarder), the forwarding entity inside an FCoE switch,FCoE Switch: Simplified Model,Ethernet Bridge,FCF,FCoE,FCoE Switch,20,Unchanged from previous FC standard VN_Port: Virtual N_Port VF_Port: Virtual F_Port VE_Port: Virt

14、ual E_Port Added to support FCoE FCoE_LEP (FCoE Link Endpoint): The data forwarding component that handles FC frame encapsulation/decapsulation, and transmission/reception of FCoE frames. FCoE Controller: the entity that implement the FIP protocol,FC-BB-5 Terminology,21,FCoE: Initial Deployment,22,F

15、CoE: Adding Blade Servers,23,FCoE: Adding Native FCoE Storage,24,FCoE: Adding VE_ports,25,FCoE frames have: MAC addresses (hop-by-hop) FC addresses (end-to-end),FCoE Addressing and Forwarding,26,FCoE MAC addresses,VE_Ports and VF_Ports always use MAC addresses derived from the switch pool VN_Ports m

16、ay use two types of MAC addresses: SPMA (Server Provided MAC Addresses) FPMA (Fabric Provided MAC Addresses) MAC Addresses are negotiated in FIP Initial deployment will use FPMA only,27,The Mapped MAC addresses,A dedicated MAC address for each FC-ID Assigned by the FC fabrics Consistent with the FC

17、model OUIs with U/L = 1 (Local addressing), called FC-MAPs Multiple FC-MAPs may be supported (one per FC fabric),28,Initial Login Flow ladder,29,1, 2, 4, (8), 10 Gbps,1, 10 . . . Gbps,10, 20 Gbps,The Most Asked Question: Is FCoE Routable?,30,Is FCoE Routable?,Most folks mean “Is FCoE IP-routable” The answer is NO, there is no IP layer in FCoE This w