解析EIGRP浮动汇总路由配置
EIGRP协议在路由计算中要对网络带宽、网络时延、信道占用率和信道可信度等因素作全面的综合考虑,所以EIGRP的路由计算更为准确,更能反映网络的实际情况,下面跟小编看一下EIGRP浮动汇总路由配置过程。
EIGRP浮动汇总路由配置过程如下:
EIGRP浮动汇总路由配置之拓扑图
实例解析EIGRP浮动汇总路由配置
EIGRP浮动汇总路由配置之接口连接
Router1 S0/0 <----> Router2 S0/0
Router2 S0/1 <----> Router3 S0/0
Router1 S0/1 <----> Router4 S0/0
Router3 S0/1 <----> Router4 S0/1
VPCS V0/1 <----> Router1 E1/0
VPCS V0/2 <----> Router3 E1/0
EIGRP浮动汇总路由配置之原理
在R1R2R3R4上均运行EIGRP路由协议。R4通过S0/1向R3通告一条 的汇总路由,并将这条浮动路由的管理距离设置为250,于是在网络连通的情况下R3上到达网段的路由经过R2,而在R2与R3链路故障的时候,通过R3前往的数据包会通过R4(R3拓扑表中,默认路由由A变为P)
EIGRP浮动汇总路由配置之关键配置
R1:
interface Serial0/0
ip address
serial restart-delay 0
!
interface Serial0/1
ip address
serial restart-delay 0
!
interface Ethernet1/0
ip address
half-duplex
!
router eigrp 100
network
network
network
no auto-summary
R2、R3略,参照R1进行接口IP和路由协议的配置,重点看下R4的配置
R4:
interface Serial0/0
ip address
serial restart-delay 0
!
interface Serial0/1
ip address
ip summary-address eigrp 100 250(向R3通过默认路由,管理距离高于EIGRP默认值)!
router eigrp 100
network
network
auto-summary
EIGRP浮动汇总路由配置之查看结果
1.R2和R3之间链路正常时
a) R3的'路由表:
R3#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is to network
D [90/2707456] via , 00:00:02, Serial0/0
C is directly connected, Ethernet1/0
C is directly connected, Serial0/1
D [90/2681856] via , 00:00:02, Serial0/0
C is directly connected, Serial0/0
D [90/3193856] via , 00:00:02, Serial0/0
D* [90/2681856] via , 00:00:00, Serial0/1
b)R3的拓扑表:
R3#sh ip eigrp topology
IP-EIGRP Topology Table for AS(100)/ID()
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
A , 1 successors, FD is Inaccessible
1 replies, active 00:00:00, query-origin: Successor Origin
Remaining replies:
via , r, Serial0/0
P , 1 successors, FD is 2681856
via (2681856/2169856), Serial0/0
P , 1 successors, FD is 2169856
via Connected, Serial0/0
P , 1 successors, FD is 3193856
via (3193856/2681856), Serial0/0
P , 1 successors, FD is 2169856
via Connected, Serial0/1
P , 1 successors, FD is 2707456
via (2707456/2195456), Serial0/0
P , 1 successors, FD is 281600
via Connected, Ethernet1/0
2.R2的S0/1设置为DOWN,观察R3路由表和拓扑表
a)R3路由表:
R3#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is to network
C is directly connected, Ethernet1/0
C is directly connected, Serial0/1
C is directly connected, Serial0/0
D* [90/2681856] via , 00:00:05, Serial0/1
b)R3的拓扑表:
R3#sh ip eigrp topology
IP-EIGRP Topology Table for AS(100)/ID()
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P , 1 successors, FD is 2681856
via (2681856/2169856), Serial0/1
P , 1 successors, FD is 2169856
via Connected, Serial0/1
P , 1 successors, FD is 281600
via Connected, Ethernet1/0