《千兆以太网组网》PPT课件.ppt

千兆以太网组网 Gigabit Ethernet Networking,David G. Cunningham William G. Lane,以太网 Ethernet 1976 Xerox Palo Alto Research Center 1980年，DEC、Intel 和 Xerox提出以太网协议标准。 以太网的设计目标(The original Ethernet goals) ： 简单(Simplicity) 价格低(Low cost) 兼容性(Compatibility) 寻址灵活(Addressing flexibility) 公平性(Fairness) 先进性(Progress),高速(High speed) 低时延(Low delay) 稳定性(Stability) 可维护性(Maintainability) 层次结构(Layer architecture),以太网的(The Ethernet Non-goals) 全双工(Full-duplex) 差错控制(Error Control) 安全性(Security) 速率灵活性(Speed Flexibility) 优先级(Priority) 不设防(Hostile User ),以太网的发展进程(The Development of Ethernet),10BASE5 10BASE2 10BROAD36 10Mbps,broadband,3600mCATV cable 10BASE-T 10Mbps,baseband,over two twisted-pair cable 100BASE-T4 100BASE-FX 1000BASE-CX 1000BASE-LX 1000Mbps,long wavelength over optical fiber 1000BASE-SX 1000Mbps,short wavelength over optical fiber,LLC - Logical Link Control,MAC Control ( optional ),MAC -Media Access Control,Reconciliation,GMII,PCS,PMA,PMD,MDI,Medium,Media Dependent PHY Group,Data Link,Medium Dependent Interface,IEEE 802.3 以太网 参考模式,Reconciliation,MII,PLS,PMA,MDI,Medium,Reconciliation,AUI,PMA,MDI,Medium,AUI,1 - 10 Mbps,10 Mbps,100- 1000Mbps,Gigabit Ethernet -RM,MAC Client Sublayer- LLC,Bridger entity,MAC Control ( optional ),MAC -Media Access Control,Reconciliation,GMII,PCS,PMA,PMD,MDI,Medium,Media Dependent PHY Group,Physical Coding Sublayer Physical Medium Attachment Sub. Physical Medium Dependent Sub.,Mdium Independent Interface,Data Link,Medium Dependent Interface,千兆以太参考模式,协调一致,1000 Base-X Gigabit Ethernet -RM,MAC Client Sublayer- LLC,Bridger entity,MAC Control ( optional ),MAC -Media Access Control,Reconciliation,GMII,PCS,PMA,SX-PMD,SX-MDI,1000 Base-X PHY,Mdium Independent Interface,Data Link,Medium Dependent Interface,协调一致,LX-PMD,LX-MDI,CX-PMD,CX-MDI,LX 光纤,SX 光纤,150 平衡铜缆,IEEE 802.3 1980 IEEE 802.3u - 1995 IEEE 802.3x&y - 1997 全双工 (交换机端口 - 网站) IEEE 802.3z -1998 IEEE 802.3ac - 1998 VLAN tagging,介质访问控制(MAC),IEEE 802.3标准和增补,IEEE Std. 802.3 - 1998 “ Information Technology - Telecommunications and information exchange between systems - Local and metropolitan area network - Specific requirements - Part 3 : Carrie Sense Multiple Access with Collision Detection ( CSMA / CD ) access method and physical layer specifications ” ISO / IEC 8802 - 3 : 1996 IEEE draft Std. 802.3 ab 1000 BASE - T UTP #5 IEEE Std. 802.3ac - 1998 Virtual Bridged LAN tagging on 802.3 Networks IEEE Std. 802.3ad : Link aggregation,Pre,SFD,DA,SA,L / T,Data,PAD,FCS,Ext,基本 MAC 帧格式和传输顺序,传输顺序：自左至右，比特流,帧开始界符 10101011,7,1,6,6,2,46 - 1500,4 Bytes,O1 O0,Most Significant Octet,Least Significant Octet,b0 b7,LSB,MSB,MSB LSB,千兆以太网 slot time 大于分组传输所需时间，半双工，则在FCS后附加填充比特。,Pr 帧头 10101010 10101010 SD 帧开始符 10101011 DA ,SA,1,G Lxxxxxx G = 0 单独地址 L = 0 全局 G = 1 组地址 L = 1 局部,L 长度字段 IEEE 802.3 1500 type 类型字段 Ethernet 1536,FCS 帧校验序列,公司号,网卡号,什么是 slot-time ？,slot-time 是冲突窗口标准所用的参数名。,参 数 10Mbps 100Mbps 1000Mbps,隙时(Slot time) 51.2 s 帧间隔(Inter Frame Gap) 9.6 s 尝试次数(Attempt Limit) 16 退避次数(Back off Limit) 10 阻塞信号(Jam Size ) 32bits Max Frame Size 1518 bytes Min Frame Size 64 bytes 地址长度(Address Size ) 6 bytes,512 bit times 0.96 s 16 10 32bits 1518bytes 64bytes,4096 bit times 0.96 s 16 10 32bits 1518bytes 64bytes,Pre,SFD,DA,SA,L / T,FCS,Ext,88,08.,MSO 01 00 LSO,1 Byte,1 Byte,MAC 控制帧格式,MAV控制 操作码,操作码参数 60 octets,2 bytes,00010001 00000001,Pre,SFD,DA,SA,L / T,FCS,Ext,88,08.,MSO 01 00 LSO,1 Byte,1 Byte,MAC 控制 ( pause ) 帧格式,MAV控制操作码 00-01,pause time 60 字节,2 bytes,00010001 00010000,LSB,MSB,Pre,SFD,DA,SA,L / T,Data,PAD,FCS,Ext,802.1Q Tag type,Tag Control info.,MSO 01 00 LSO,0,7,LS b MS b,81-00,2 Byte,2 Byte,1000-0001 0000-0000 ( 33024 ),VLAN - Tagged MAC 帧格式,42 - 1496 Octets,IEEE 802.1QTag,Pre,SFD,DA,SA,L / T,Data,PAD,FCS,Ext,802.1Q Tag type,Tag Control info.,2 Byte,2 Byte,User Priority,CFI,VLAN identifier,b2,b0,b11,b0,VLAN - Tagged MAC 控制信息字段 ( 802.1Q ),CFI : Canonical Format Indicator 用于指示在MAC Client 数据字段内有无 路由信息字段(RIF)。,用户优先级：0 - 7 ， 7为高优先级。,MSO,LSO,Pre,SFD,DA,SA,L / T,Data,PAD,FCS,Ext,802.1Q Tag type,Tag Control info.,2 Byte,2 Byte,CFI,VLAN identifier,3,b4,12 bit,b8,b11,b7,b0,VLAN - Tagged MAC 控制信息字段 ( 802.3 ),User Priority,b0 b2,VLAN identifier,帧类型判别,如帧内 Length / Type 字段的值 1500 LLC 数据帧 = 34824 ( 88 - 08 ) MAC 控制帧 = 33024 ( 81 - 00 ) VLAN - tagged 帧,8B10B编码,8B10B码表： 256种组合 数据码组 ( 标为 D )：用于数据传输； 特定控制码组 ( 标为K )：控制序列传输( comma, ordered-sets, and so forth )；,码组名 Octet 值 HGF EDCBA abcdei fghj RD(-) abcdei fghj RD(+) D0.0 00 000 00000 100111 0100 011000 1011 D20.1 34 001 10100 001011 1001 001011 1001 D10.3 6A 011 01010 010101 1100 010101 0011,(34)H = 52 20 + 32 (6A)H =106 10 + (32x3),Data Label Data Bit Current RD(-) Current RD(+) EDCBA abcdei abcdei,D0 00000 100111 011000 D1 00001 011101 100010 D2 00010 101101 010010 D3 00011 110001 110001 D4 00100 110101 001010 D5 00101 101001 101001 D6 00110 011001 011001 D7 00111 111000 000111,5B6B 数据编码,1,Data Label Data Bit Current RD(-) Current RD(+) EDCBA abcdei abcdei,D8 01000 111001 000110 D9 01001 100101 100101 D10 01010 010101 010101 D11 01011 110100 110100 D12 01100 001101 001101 D13 01101 101100 101100 D14 01110 011100 011100 D15 01111 010111 101000,2,Data Label Data Bit Current RD(-) Current RD(+) EDCBA abcdei abcdei,D16 10000 011011 100100 D17 10001 100011 100011 D18 10010 010011 010011 D19 10011 110010 110010 D20 10100 001011 001011 D21 10101 101010 101010 D22 10110 011010 011010 D23 10111 111010 000101,3,Data Label Data Bit Current RD(-) Current RD(+) EDCBA abcdei abcdei,D24 11000 110011 001100 D25 11001 100110 100110 D26 11010 010110 010110 D27 11011 110110 001001 D28 11100 001110 001110 D29 11101 101110 010001 D30 11110 011110 100001 D31 11111 101011 010100,4,Data Label Data Bit Current RD(-) Current RD(+) HGF fghi fghi,.1 000 1011 0100 .1 001 1001 1001 .2 010 0101 0101 .3 011 1100 0011 .4 100 1101 0010 .5 101 1010 1010 .6 110 0110 0110 .7 111 1110 or 0111 0001 or 1000,Data Label Data Bit Current RD(-) Current RD(+) EDCBA abcdei abcdei,K23 10111 111010 000101 K27 11011 110110 001001 K28 11100 010110 110000 K29 11101 110110 010001 K30 11110 011110 100001,5B6B 特定组编码,.1 000 1011 0100 .1 001 1001 1001 .2 010 1010 0101 .3 011 1100 0011 .4 100 1101 0010 .5 101 0101 1010 .6 110 1001 0110 .7 111 0111 1000,Data Label Data Bit Current RD(-) Current RD(+) HGF fghi fghi,3B4B 特定组编码,千兆以太网8B10B 码特性：,High transition density of 3 - 8 transitions per 10 - bit code group DC balance ; maximum run length of 5 ; maximum running digital sum ( RDS ) of 3 Separate code - group for data and control signaling A comma for code - group synchronization Excellent error detection capabilities, especially with CRC 32, the frame check sequence in the MAC frame format IBM research Lab,公共物理子层：协调一致(Reconciliation)和 千兆介质独立接口(GMII),MAC Client Sublayer- LLC,Bridger entity,MAC Control ( optional ),MAC -Media Access Control,Reconciliation,GMII,PCS,PMA,SX-PMD,SX-MDI,1000 Base-X PHY,Mdium Independent Interface,Data Link,Medium Dependent Interface,协调一致,LX-PMD,LX-MDI,CX-PMD,CX-MDI,LX 光纤,SX 光纤,150 平衡铜缆,G M I I,PLS_DATA.request( OUTPUT_UNIT),PLS_Signal.indicate ( SIGNAL_STATUS),PLS_DATA.Indicate(INPUT_UNIT),PLS_CARRIER.indicate ( CARRIER_STATUS),PLS_DATA_VALID.indicate ( DATA_ VALID_STATUS),Reconciliation Sub.,Station Mng.,PCS:Physical Coding Sublayer,Collision Detection,TxD ( Data、Control、Clock),RxD ( Data、Control、 Clock),Carrier Sense,Mng Data I/O and Control,MAC,物理层信令(PLS),物理编码、物理介质附加和自动协商：,MAC Client Sublayer- LLC,Bridger entity,MAC Control ( optional ),MAC -Media Access Control,Reconciliation,GMII,PCS,PMA,SX-PMD,SX-MDI,1000 Base-X PHY,Mdium Independent Interface,Data Link,Medium Dependent Interface,协调一致,LX-PMD,LX-MDI,CX-PMD,CX-MDI,LX 光纤,SX 光纤,150 平衡铜缆,Memory,Memory,LAN Control Chip,Memory,Memory,SERDES Chip,10bits,10bits,并行接口,收发器,PMD,PMA,PCS,MAC,物理层,数据链路层,MAC、存储和接口逻辑8B10B编/解码,串行接口,物理编码子层 ( Physical Coding Sub_layer ),Transmit,Carrier Sense,Receive,Auto-Nego,Sync,tx_code-group,rx_code-group,SIGNAL_DETECT,Sync_status,RxD,TxD,COL,CRS,TX_EN TX_ER GTX_CLK,RX_DV RX_ER RX_CLK,Transmitting,Recieving,Xmit,see note,并行接口,PMA: Physical Medium Attachment,Code-group Aligment,P - S变换,S - P变换,Loop Back,Tx_bit,Rx_bit,1250 M code-bit / s,SIGNAL_DETECT,Sync.,PMD: Physical Medium Dependent Sublayer,Transmitter,Tx_bit,Rx_bit,1250 M code-bit / s,SIGNAL_DETECT,Recieve,Transmit signal,Receive si