请教双向双点重发布怎么产生异常问题

动态路由协议有一系列的安全措施可以避免环路，最终的选路会装在路由表中。有管理距离和度量值在比较，怎么会产生问题？若产生环路，有什么特征可以说明呢？
我很糊涂？？？分析不出来！

我设计实验如下：希望大家帮助发现问题



配置：
-------------------------------------------------------------------------------------------------------

R1#show run
!
version 12.3
!
hostname R1
!
interface Loopback0

ip address 1.1.1.1 255.255.255.0
!

interface Serial1/0

ip address 13.1.1.1 255.255.255.0
!
interface Serial1/1

ip address 12.1.1.1 255.255.255.0
!
router eigrp 100

network 12.1.1.0 0.0.0.255

network 13.1.1.0 0.0.0.255

no auto-summary
!

end

-------------------------------------------------------------------------------------------------------
R2#show run
!
version 12.3
!
hostname R2
!
interface Loopback0

ip address 2.2.2.2 255.255.255.0
!
interface Serial1/0

ip address 12.1.1.2 255.255.255.0
!
interface Serial1/1

ip address 24.1.1.2 255.255.255.0
!
router eigrp 100

redistribute ospf 10 metric 10000 100 255 1 1500

//OSPF重发布EIGRP

network 12.1.1.0 0.0.0.255

no auto-summary
!


router ospf 10
redistribute eigrp 100 subnets
//EIGRP重发布进OSPF

network 24.1.1.0 0.0.0.255 area 0
!
end
-------------------------------------------------------------------------------------------------------
R3#show run
!
version 12.3
!
hostname R3
!
interface Loopback0

ip address 3.3.3.3 255.255.255.0
!
interface Serial1/0

ip address 35.1.1.3 255.255.255.0
!
interface Serial1/1

ip address 13.1.1.3 255.255.255.0
!
router eigrp 100

redistribute ospf 10 metric 10000 100 255 1 1500

//OSPF重发布EIGRP
network 13.1.1.0 0.0.0.255

no auto-summary
!
router ospf 10
redistribute eigrp 100 subnets

//EIGRP重发布OSPF

network 35.1.1.0 0.0.0.255 area 0
!
end
-------------------------------------------------------------------------------------------------------
R4#show run
!
version 12.3
!
hostname R4
!
interface Loopback0

ip address 4.4.4.4 255.255.255.0

ip ospf network point-to-point
!
interface Serial1/0

ip address 24.1.1.4 255.255.255.0
!
interface Serial1/1

ip address 45.1.1.4 255.255.255.0
!
router ospf 10

log-adjacency-changes

redistribute connected subnets
//将环回口地址发布进OSPF产生O E2

network 24.1.1.0 0.0.0.255 area 0
为了和EIGRP发布进来的O E2比较

network 45.1.1.0 0.0.0.255 area 0
看看会不会产生问题
!
end
-------------------------------------------------------------------------------------------------------
R5#show run
!
version 12.3
!
hostname R5
!
interface Loopback0

ip address 5.5.5.5 255.255.255.0

ip ospf network point-to-point
!
interface Serial1/0

ip address 45.1.1.5 255.255.255.0
!
interface Serial1/1

ip address 35.1.1.5 255.255.255.0
!
router ospf 10
network 5.5.5.0 0.0.0.255 area 0

network 35.1.1.0 0.0.0.255 area 0

network 45.1.1.0 0.0.0.255 area 0
!
end

很简单,那就发布一次够了,多了就出现情况了