各種協(xié)議報(bào)文頭(共7頁(yè)).doc

1、 IPV4 與IPV6的IP包頭其中服務(wù)類(lèi)型對(duì)應(yīng)傳輸流類(lèi)型，數(shù)據(jù)包總長(zhǎng)度對(duì)應(yīng)有效載荷長(zhǎng)度，生存時(shí)間對(duì)應(yīng)跳數(shù)限制Bgp：基本頭部：Marker(16 byte)Length(2 byte)Type(1 byte)Open報(bào)文頭部（基本頭部以下部分）：Optional Paramenters LengthHold TimeVersionMy Autonomous SystemBGP IdentifierOptional ParamentersKeepalive報(bào)文頭部：只有基本頭部Update報(bào)文頭部：Withdrawn RoutesUnfeasible Routes LengthPat

2、h Attribute LengthNetwork Layer Reachability InformationPath AttributeNotification報(bào)文頭部：DataError CodeError Subcode其中的error code為：錯(cuò)誤代碼123456錯(cuò)誤類(lèi)型消息頭錯(cuò)OPEN消息錯(cuò)UPDATE消息錯(cuò)保持時(shí)間超時(shí)狀態(tài)機(jī)錯(cuò)退出ISIS：OSI網(wǎng)絡(luò)層地址編碼方式: NSAP特殊bit：Up/down 比特：從L2leakig至L1的路由ATT bit：從L1L2向L1發(fā)送的路由包含的該bit為1，L1根據(jù)該bit自動(dòng)計(jì)算生成到最近的L1L2默認(rèn)路由。Overload bit

3、：當(dāng)路由振蕩時(shí)，BGP與ISIS路由沒(méi)有達(dá)成同步時(shí)，isis發(fā)送該bit的路由，表明，只能把目的地址是這些路由的數(shù)據(jù)包轉(zhuǎn)發(fā)給我，其他數(shù)據(jù)包不能轉(zhuǎn)發(fā)。Ospf頭部：LSA頭部：Hello報(bào)頭：在option中有一個(gè)Ebit，表明是否是stub區(qū)域。如果一個(gè)配置，一個(gè)沒(méi)有配置，則無(wú)法建立鄰居關(guān)系802.1q幀頭（以太網(wǎng)幀頭18B，加上tag共22B。DASAType/LenDataFCSDASAType/LenDataFCSTAGEtherType PRIVLAN-IDCFI(Token-Ring Encapsulation Flag)4 Bytes2 Bytes3bits1bit12bits0-

4、70 - 40950-1Value = 0x81006B6B2B42-1500B4B46-1500B8011ad（QinQ）N-PE 4Ethernet UNIPWLength/Type (2B)Client Data (38-1500)Ethernet FCS (4B)MAC Dest Addr (6B)MAC SRC Addr (6B)EtherType (0x88A8) (2B) “S-Tag” 802.1Q tag (2B)EtherType (0x8100) (2B) “C-Tag” 802.1Q tag (2B)1514131211109876543210VLAN ID(12 Bit)CFI(1 Bit)Priority(3 Bit)BPDU的幀格式： DA is always Multicast Address: 01-80-c2-00-00-00 SA is the MAC address of the port that is sending out this BPDU (sh mod output) DSAP=SSAP=0x42 or 01000010. Same in