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RIP does not resdistribute own static route to other router on the same L2 network.

Dear Expert,

I have a question.

This case is My RIP Lab's question.

Refer to the attacment NW diagram.

My RIP Lab are 4 rip routers.
They are enabled rip version2 and no auto-summary command.
And The R2 router is enabled redistribute static function to RIP v2 domain.
The R2 router is configured a static route "172.16.0.0/16 nexthop R1".
But R2 does not redistribute it to other routers. (R3 and R4).

I think that R2,R1,R3 and R4 are connected on the same L2 network.
So, The R2 router does not redistribute own static route ?

Please give me some advice.

Best regards,
takuro.

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
VIP Mentor

Hi

Based on your design, each router has 1 interface RIP enabled. 

The subnet you're trying to redistribute from R2 is the same as R1 is announcing. 

RIPv2 has a prevention loop called split-horizon, like all distance vector protocol.

Split Horizon goal: RIPv2 will not send updates back out of the interface on which they were received .

If this is a lab, and ONLY for testing, you can deactivate split-horizon, but be careful you'll probably face a loop.

Thanks 

PS: Please don't forget to rate and mark as correct answer if this solved your issue 


Thanks
Francesco
PS: Please don't forget to rate and select as validated answer if this answered your question

View solution in original post

5 REPLIES 5
Highlighted
VIP Mentor

Hi

Based on your design, each router has 1 interface RIP enabled. 

The subnet you're trying to redistribute from R2 is the same as R1 is announcing. 

RIPv2 has a prevention loop called split-horizon, like all distance vector protocol.

Split Horizon goal: RIPv2 will not send updates back out of the interface on which they were received .

If this is a lab, and ONLY for testing, you can deactivate split-horizon, but be careful you'll probably face a loop.

Thanks 

PS: Please don't forget to rate and mark as correct answer if this solved your issue 


Thanks
Francesco
PS: Please don't forget to rate and select as validated answer if this answered your question

View solution in original post

Highlighted

Dear supportlan,


Thank you for your advice.
Thanks to you I was able to understand that.
I agree with you.

Thank you in advance for your help.


Best ragards,
takuro.

Highlighted

You're very welcome 


Thanks
Francesco
PS: Please don't forget to rate and select as validated answer if this answered your question
Highlighted
Beginner

  • Even R2 redistribute static route into RIPv2, R3 and R4 will still prefer route 172.16.0.0/16 from R1 as its HOP=0 rather than from R2 with HOP=3. 
  • Configuring this static route on R2 can not perform route backup for R2, R3, R4. Wether R1's 10.255.0.1 or 172.16.0.0/16 is disconnected, R2/R3/R4 will lose connection with 172.16.0.0/16.
Highlighted

Dear David_Che,


Thank you for your advice.
Thanks to you I was able to understand that.
Thank you in advance for your help.


Best ragards,
takuro.