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分层模型OSI          TCP/IP7层           4/5理论         实践               跨层封装（telnet 和ping）、BPDU网络分层接入层 :IP,DHCP,vlan trunk,流量过滤acl，security分布层:policy核心层:高速转发DHCPserver POOL ip mask gw dns1

1、传播范围2、默认值3、值大好还是小好8、Prefer the path through the closest iGPneighbor.11，65，环回口R3#show ip bgp 2.2.2.0/24BGP routing table entry for 2.2.2.0/24, version 3Paths: (2 available, best #2, table

Example:Next Hop on a Multiaccess NetworkThe following takes place in a multiaccess netowrk:*Router B advertisesnetwork 172.30.0.0 to router A in EBGP with a next hop of 10.10.10.2,not 10.10.1

Example :Next Hop on a Multiaccess NetworkThe following takes place in a multiaccess network:1.Router B advertisesnetwork 172.30.0.0 torouter A in EBGP witha next hop of 10.10.10.2,not 10.10.10

BGP Autonomous SystemsAS号：公有 0-64511        ：私有:64512-65535AS号查询http://www.cidr-report.org/as6447/autnums.htmlBGP Path-Vector RoutingAS相当于一个大路由器AS-by-AS BGP CharacteristicsBGP is most a

Using Multiple IP Routing ProtocolsUsing Seed MetricsUse the default-metric command to establish theseed metricfor the route or specify the metric when redistributing.Once a compatible metric is

The IS-iS ProtocolIntroducing IS-IS and Integrated IS-IS RoutingIS-IS -----------------OSIOSPF ----------------TCP/IPISIS工作在OSI 哪一层。CLNS(无连接的网络服务)，CONS（Connection-oriented Netw...

OSPF Network Types接口有默认网络类型。1,Loopback,默认网络类型为Loopback,特点，不管配置为多少位的掩码，都为32位。2，Point-to-PointSerial/BRI FR's P2Psub-if 通过组播更新，没有DR3,Broadcast Ethernet 组播更新，有DR。4，NBMA ...

Configuring OSPF Special Area TypesTypes of AreasStub and Totally Stub Area RulesHello 1,hello 2,area 3,atuh 4stub标识 ...

单个区域，会造成非常多的LSAs，路由表过大，占用过多带宽分区域设计，减少路由更新流量典型的组网图Types of OSPF RoutersABRASBR （OSPF RIP EIGRP ）LSA Type 1 :Router LSA1、传播范围（本区域）2、通知者，谁产生的（路由器）3、包含的内容（拓扑信息，路由）...

Config OSPF Introducing the OSPF ProtocolLink-State Protocols 1、范围(IGP) 2、设计原理(Link-State) 3、有类和无类( 无类，CIDR)封装 IP OSPF(IP报文封装，Port：89 ) 组播地址：224.0.0.5，224.0.0.6LSA:链路状态通告。LSDB:Link-State D...

封装E2 IP eigrpP=88224.0.0.10向EIGRP注入默认路由 方法1：重分布静态 R1配有默认路由 重分布redistributeip route 0.0.0.0 0.0.0.0 s2/1R1(config-router)#redistribute static方法2：network 0.0.0.0R1上配有默认路由network 0.0

implementing MulticastExplaining MulticastWhyMulticast?Used when sending same data tomultiple receiversBetter bandwidthutilizationLess host/routerprocessingUsed when addresses ofreceivers u