网络技术培训-EIGRP技术原理与配置

1、EIGRP技术原理与配置网络技术基础培训材料EIGRP 特性组播和单播替代广播支持VLSM和不连续子网在任何一个节点可以进行手动汇总支持多种网络层协议支持等代价和非等代价负载均衡高级距离矢量快速收敛配置简单增量更新100%无环的无类路由协议初始路由发现邻居建立可以让两者在确定对方的身份之后再进行更深入的交流。EIGRP MetricEIGRP 计算 metric 的标准选项 :BandwidthDelayEIGRP 计算 metric的可选项:ReliabilityLoadEIGRP的三张表DUAL TerminologySelects lowest-cost, loop-free paths

2、 to each destinationAD = cost between the next-hop router and the destination FD = cost from local router = AD of next-hop router + cost between the local router and the next-hop router Lowest-cost = lowest FDR1R3R210.10.0.0（20）（10）（10）（10）FD=20AD=10DUAL Terminology(Current) successor = next-hop rou

3、ter with lowest-cost, loop free pathFeasible successor = backup router with loop-free path (AD of feasible successor must be less than FD of current successor route)R1R3R210.10.0.0（20）（10）（10）（10）FD=30AD=20R5R4（20）（10）AD=30Network X Next Hop: BMetric : 9Network X Metric : 14Network X Metric : 8Netwo

4、rk X Metric : 5FD=9A or C = Feasible Successor ? FC = AD FDFD = 5 + 4 = 9AD(A) = 8 A = Feasible SuccessorAD(C) = 14 C Feasible SuccessorSuccessorNetwork XMetric : 4Metric : 6Metric : 5AD=14AD = 8DUAL TerminologyEIGRP 路径计算（路由器 C）Router C Tables:配置 EIGRP指定本机上哪些接口能够参与EIRGP进程使用主类通告 Network 10.0.0.0表示只要一

5、个接口的IP属于10.0.0.0这个主类网络，就可以参与EIGRP的进程。使用通配符掩码EIGRP的标准通告方式是：network 接口网络地址 接口反掩码（0和1置换过的掩码）Network 172.16.3.0 0.0.0.255 表示只要一个接口IP的前24bit和172.16.3.0的前24bit一一匹配就可以参与EIGRP进程，这里的方法并不唯一验证 EIGRP: show ip eigrp neighborsRouterX# show ip eigrp neighborsIP-EIGRP Neighbors for process 77Address Interface Holdt

6、ime Uptime Q Seq SRTT RTO (secs) (h:m:s) Count Num (ms) (ms)172.16.81.28 Ethernet1 13 0:00:41 0 11 4 20172.16.80.28 Ethernet0 14 0:02:01 0 10 12 24172.16.80.31 Ethernet0 12 0:02:02 0 4 5 20验证 EIGRP: show ip route eigrp验证 EIGRP: show ip protocols验证 EIGRP: show ip eigrp topologyRouterX# show ip eigrp

7、topologyIP-EIGRP Topology Table for process 77Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply statusP 172.16.90.0 255.255.255.0, 2 successors, FD is 46251776 via 172.16.80.28 (46251776/46226176), Ethernet0 via 172.16.81.28 (46251776/46226176), Ethernet1P 172.16.81.0 255.2

8、55.255.0, 2 successors, FD is 307200 via Connected, Ethernet1 via 172.16.81.28 (307200/281600), Ethernet1 via 172.16.80.28 (307200/281600), Ethernet0 RouterX# debug ip eigrpIP-EIGRP: Processing incoming UPDATE packetIP-EIGRP: Ext 192.168.3.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 10

9、4960IP-EIGRP: Ext 192.168.0.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 104960IP-EIGRP: Ext 192.168.3.0 255.255.255.0 M 386560 - 256000 130560 SM 360960 256000 104960IP-EIGRP: 172.69.43.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 172.69.43.0 255.255.255.0 metric 371200

10、 - 256000 115200IP-EIGRP: 192.135.246.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 192.135.246.0 255.255.255.0 metric 46310656 - 45714176 596480IP-EIGRP: 172.69.40.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 172.69.40.0 255.255.255.0 metric 2272256 - 1657856 614400IP

11、-EIGRP: 192.135.245.0 255.255.255.0, - do advertise out Ethernet0/1IP-EIGRP: Ext 192.135.245.0 255.255.255.0 metric 40622080 - 40000000 622080IP-EIGRP: 192.135.244.0 255.255.255.0, - do advertise out Ethernet0/1debug ip eigrpNote: EIGRP routes are exchanged only when a change in topology occurs.EIGRP 和不连续子网默认情况下，EIGRP在网络边界执行汇总，无法支持不连续子网。no auto-summary解决不连续子网通过no auto-summary命令关闭网络边