Routing Loop in my Project - RIP + OSPF

[iPhoneFreak]

I do have a routing loop between routers R1 and R2. Does anyone of you have any suggestion for me on how to solve the problem?

I did attach my project in Packet Tracer!

[Martin L]

it happens because u have 2 redistribution points; so obviously change/make to 1 redistribution point;

otherwise, 2 ways to prevent loops: changing AD and filleting routes based on tags

not sure if you can apply either solution in PT since it just a sim; u could use GNS3

in case of RIP /OSPF, there was good video on youtube by INE Brian McG - if i can find it, i attach link

Regards, ML
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[iPhoneFreak]

That did not really help me. I entered the no command for both the redistribute rip subnets and the redistribute ospf 1 metric 12 commands only on Router R1 and there still is the routing loop. Any suggestions?

[Georg Pauwen]

Hello,

the only 'loop' I could see was that OSPF has two paths. That is because by default, OSPF does equal cost load balancing over 4 links. If you want to get rid of the dual paths on R1 and R2, configure the below on Serial0/1/0 on both routers:

ip ospf cost 100

[iPhoneFreak]

Even if I enter the command on both Routers, there still is no change and the packets go on between R1 and R2 forever.

[Georg Pauwen]

Hello, 

which packets are looping, what source and destination IP addresses ?

[iPhoneFreak]

If I use the simple PDU option in PT and firstly click on the PC1 and then on the PC11 for instance, then the routing loop occurs.

[Georg Pauwen]

Hello,

on R2, you could increase the OSPF distance:

R2

router ospf 1
log-adjacency-changes
redistribute rip metric 500 subnets
network 10.64.0.0 0.31.255.255 area 0
network 10.0.0.0 0.31.255.255 area 0
network 192.168.1.64 0.0.0.63 area 0
network 10.128.0.0 0.63.255.255 area 0
--> distance ospf external 200
!