1. EIGRP管理距离引起路由震荡的原因及解决

2. [08-24 16:25:29]   来源：http://www.85jc.com  网络故障   阅读：8471次

概要：C 1.1.4.4/32 is directly connected, Loopback0O 1.1.3.3/32 [110/65] via 1.1.234.3, 00:00:14, Serial1/0O 1.1.2.2/32 [110/65] via 1.1.234.2, 00:00:14, Serial1/0O E1 1.1.1.1/32 [110/164] via 1.1.234.3, 00:00:14, Serial1/0 [110/164] via 1.1.234.2, 00:00:14, Serial1/0O E1 1.1.123.0/24 [110/164] via 1.1.234.3, 00:00:14, Serial1/0 [110/164] via 1.1.234.2, 00:00:14, Serial1/0C 1.1.234.0/24 is directly connec

EIGRP管理距离引起路由震荡的原因及解决,标签：网络故障解决,网络故障排除,http://www.85jc.com
C       1.1.4.4/32 is directly connected, Loopback0
O       1.1.3.3/32 [110/65] via 1.1.234.3, 00:00:14, Serial1/0
O       1.1.2.2/32 [110/65] via 1.1.234.2, 00:00:14, Serial1/0
O E1    1.1.1.1/32 [110/164] via 1.1.234.3, 00:00:14, Serial1/0
                   [110/164] via 1.1.234.2, 00:00:14, Serial1/0
O E1    1.1.123.0/24 [110/164] via 1.1.234.3, 00:00:14, Serial1/0
                     [110/164] via 1.1.234.2, 00:00:14, Serial1/0
C       1.1.234.0/24 is directly connected, Serial1/0  
第二种情况
在R1的S1/2接口接入R5，并启用RIPV2
 R5
conf t
int s1/2
ip add 192.168.45.5 255.255.255.0
no shut
router rip
ver 2
no auto
net 192.168.45.0
end  R1
conf t
int s1/2
no shut
ip add 192.168.45.4 255.255.255.0
router rip
ver 2
no au
net 192.168.45.0
end    
把RIP再分发到EIGRP1中
router eigrp 1
redistribute rip metric 10000 100 255 1 1500
end     这时看R2和R3上的路由表   R2(config)#do sh ip route     
Codes: C - connected, S - static, 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
       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 not set      1.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O       1.1.4.4/32 [110/65] via 1.1.234.4, 00:31:58, Serial1/0
D       1.1.3.3/32 [90/156160] via 1.1.123.3, 00:05:56, FastEthernet0/0
C       1.1.2.2/32 is directly connected, Loopback0
D       1.1.1.1/32 [90/156160] via 1.1.123.1, 00:05:56, FastEthernet0/0
C       1.1.123.0/24 is directly connected, FastEthernet0/0
C       1.1.234.0/24 is directly connected, Serial1/0
O E1 192.168.45.0/24 [110/164] via 1.1.234.3, 00:05:59, Serial1/0
R2(config)#do ping 192.168.45.5 Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.45.5, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)      仔细查看路由表可以发现，R2到192.168.45.0网段下一跳是1.1.234.2，也就是R3的S1/0接口，但是拓扑上表明下一跳为R1的F0/0接口为最佳路径。为什么会出现这样的情况呢
   我们知道，EIGRP的AD(管理距离）有两（电脑没声音）种情况：
     1，当收到内部路由时，AD为90，路由表里（电脑自动关机）的标识为“D”
     2，当收到外部转发的路由是，AD为170，路由表里（电脑自动关机）的标识为“ D EX”
   当R1把RIP再分发到EIGRP1中的时候，R2和R3的收到192.168.45.0网段为“D EX"标识（可以通过shou ip bgp top命令校验)，这时EIGRP的AD为170，当R2把EIGRP1再分发到OSPF中后，因为的OSPF的AD为110，R3会从R1和R2这个两（电脑没声音）个路由器上收到192.168.45.0这个路由条目，根据路由选路原则，R3会优先选择OSPF协议收到的路由，所以在路由表上显示“O E1”，这样的结果会造成数据包在R4和R2之间震荡，

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