【正文】 常用的路由策略工具中，能夠用來增加或者刪除AS 路徑的有 aspathfiler 協(xié)議支持一種消息在BGP 鄰居之間周期性地發(fā)送，用以維護(hù)連接關(guān)系。 ：OSPF 協(xié)議不同的網(wǎng)絡(luò)類型可以形成FULL 狀態(tài)的鄰接關(guān)系。 ，路由器 ASBR1 (Router ID: )引入一條RIP 。 網(wǎng)絡(luò)中可以通過命令filterlsaout peer 對(duì)發(fā)送的LSA 進(jìn)行過濾 “OSPF/2/IFAUTFAIL(OID)[]: A packet is received on a nonvirtualinterface from a router whose authentication key or authentication type conflicts with the localauthentication key or authentication type. (IfIpAddress=[ipaddress], AddressLessIf=[interfaceindex],ProcessId=[processid], RouterId=[routerid], PacketSrc=[sourceipaddress],ConfigErrorType=[errortype], PacketType=[packettype], InstanceName=[instancename])”的描述錯(cuò)誤的是：。 的ASBRSummaryLSA 中LSA 頭部信息描述錯(cuò)誤的是： State ID 表示ASBR 的Router ID Router 表示該ABR 的Router ID Router 字段永遠(yuǎn)不會(huì)改變 表示該ABR 到達(dá)ASBR 的OSPF 開銷 外部路由種類描述正確的是： 外部路由一共有5 種 第一類外部路由的開銷值只是AS 外部開銷值，互聯(lián)AS 內(nèi)部開銷值 第二類外部路由的開銷值為AS 內(nèi)部開銷與AS 外部開銷之和，OSPF 的第一類外部路由永遠(yuǎn)比第二類外部路由優(yōu)先 的Link ID 是 的路由器的Router ID 的端口IP 地址 的Router ID 命令描述錯(cuò)誤的是： 的LSDB 中外部路由的最大數(shù)量 中的第五類LSA 超過所配置的最大數(shù)目時(shí)，路由器進(jìn)入超載狀態(tài)，此時(shí)路由器將自身產(chǎn)生的第五類LSA 在網(wǎng)絡(luò)中老化，并不在生成新的第五類LSA 路由器不能接受其他路由器產(chǎn)生的第五類LSA ： 間隔，都會(huì)發(fā)送HELLO 消息 間隔，都會(huì)發(fā)送HELLO 消息 消息是被抑制的，所以沒有辦法檢測(cè)到對(duì)端是否處于活動(dòng)機(jī)制 檢測(cè)到按需電路建立連接之后，向?qū)Χ税l(fā)送自身生成的RouterLSA；如果對(duì)端回應(yīng)LS Ack，表示對(duì)端鄰居處于活動(dòng)狀態(tài) 的網(wǎng)絡(luò)類型和特點(diǎn)描述正確是：，通常以組播形式發(fā)送Hello 報(bào)文、LSU 報(bào)文和LSAck 報(bào)文，以單播形式發(fā)送DD報(bào)文和LSR 報(bào)文。 配置中不必使用routerid 命令配置routerid，配置方法和OSPFv2 一樣 和OSPFv3 配置接口命令的區(qū)別是OSPFv2 使用network 命令，而OSPFv3 直接在接口上使能 鄰居無法建立，display ospf error 給出如下信息，有可能的原因是[RTB]display ospf errorOSPF Process 1 with Router ID OSPF error statistics:General packet errors:0 : IP: received my own packet 0 : Bad packet0 : Bad version 0 : Bad checksum10 : Bad area id 0 : Drop on unnumbered interface0 : Bad virtual link 0 : Bad authentication type0 : Bad authentication key 0 : Packet too small0 : Packet size ip length 0 : Transmit error0 : Interface down 0 : Unknown neighborHELLO packet errors:0 : Netmask mismatch 0 : Hello timer mismatch0 : Dead timer mismatch 0 : Extern option mismatch0 : Router id confusion 0 : Virtual neighbor unknown0 : NBMA neighbor unknownDD packet errors:0 : Neighbor state low 0 : Router id confusion0 : Extern option mismatch 0 : Unknown LSA type0 : MTU option mismatchLS ACK packet errors:0 : Neighbor state low 0 : Bad ackThe safer , easier way to help you pass any IT exams.20 / 820 : Duplicate ack 0 : Unknown LSA typeLS REQ packet errors:0 : Neighbor state low 0 : Empty request0 : Bad requestLS UPD packet errors:0 : Neighbor state low 0 : Newer selfgenerate LSA0 : LSA checksum bad 0 : Received less recent LSA0 : Unknown LSA typeOpaque errors:0 : 9out of flooding scope 0 : 10out of flooding scope0 : 11out of flooding scopeRetransmission for packet over Limitation errors:0 : Number for DD Packet 0 : Number for Update Packet0 : Number for Request PacketReceive Grace LSA errors:0 : Number of invalid LSAs 0 : Number of policy failed LSAs0 : Number of wrong period LSAsConfiguration errors:0 : Tunnel cost mistake0 : The network type of the neighboring interface is not consistent. ID 沖突 不匹配 不一致 鄰居無法建立，display ospf error 給出如下信息，有可能的原因是[RTB]display ospf errorOSPF Process 1 with Router ID OSPF error statistics:General packet errors:0 : IP: received my own packet 0 : Bad packet0 : Bad version 0 : Bad checksum0 : Bad area id 0 : Drop on unnumbered interface0 : Bad virtual link 8 : Bad authentication type0 : Bad authentication key 0 : Packet too small0 : Packet size ip length 0 : Transmit error0 : Interface down 0 : Unknown neighborHELLO packet errors:0 : Netmask mismatch 0 : Hello timer mismatch0 : Dead timer mismatch 0 : Extern option mismatch0 : Router id confusion 0 : Virtual neighbor unknown0 : NBMA neighbor unknownDD packet errors:0 : Neighbor state low 0 : Router id confusion0 : Extern option mismatch 0 : Unknown LSA type0 : MTU option mismatchLS ACK packet errors:0 : Neighbor state low 0 : Bad ack0 : Duplicate ack 0 : Unknown LSA typeLS REQ packet errors:0 : Neighbor state low 0 : Empty request0 : Bad requestLS UPD packet errors:0 : Neighbor state low 0 : Newer selfgenerate LSA0 : LSA checksum bad 0 : Received less recent LSA0 : Unknown LSA typeOpaque errors:0 : 9out of flooding scope 0 : 10out of flooding scope0 : 11out of flooding scopeRetransmission for packet over Limitation errors:0 : Number for DD Packet 0 : Number for Update Packet0 : Number for Request PacketReceive Grace LSA errors:0 : Number of invalid LSAs 0 : Number of policy failed LSAs0 : Number of wrong period LSAsConfiguration errors:0 : Tunnel cost mistake0 : The network type of the neighboring interface is not consistent. ID 沖突 時(shí)間間隔和Dead 時(shí)間間隔不一致 鄰居無法建立，display ospf error 給出如下信息，有可能的原因是[RTB]display ospf errorOSPF Process 1 with Router ID OSPF error statistics:General packet errors:0 : IP: received my own packet 0 : Bad packet0 : Bad version 0 : Bad checksum0 : Bad area id 0 : Drop on unnumbered interface0 : Bad virtual link 0 : Bad authentication type3 : Bad authentication key 0 : Packet too small0 : Packet size ip length 0 : Transmit error0 : Interface down 0 : Unknown neighborHELLO packet errors:0 : Netmask mismatch 0 : Hello timer mismatch0 : Dead timer mismatch 0 : Extern option mismatch0 : Router id confusion 0 : Virtual neighbor unknown0 : NBMA neighbor unknownDD packet errors:0 : Neighbor state low 0 : Router id confusion0 : Extern option mismatch 0 : Unknown LSA type0 : MTU option mismatchLS ACK packet errors:0 : Neighbor state low 0 : Bad ack0 : Duplicate ack 0 : Unknown LSA typeLS REQ packet errors:0 : Neighbor state low 0 : Empty request0 : Bad requestLS UPD packet errors:0 : Neighbor state low 0 : Newer selfgenerate LSA0 : LSA checksum bad 0 : Received less recent LSA0 : Unknown LSA typeOpaque errors:0 : 9out of flooding scop