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New Member

Split Horizon in RIP

Hi ALL:

I have a boradcast topology .In which R0 ,R1,R2 are on same subnet.
R0 and R2 are running OSPF. R1 and R2 are running RIP
Now, R0 advertises 1.1.1.1 through OSPF to R2 that R2 must redistribute in RIP.

As per my understanding R2 will not advertise those OSPF routes redistributed  to R1 because of split horizon.
But in my case i am getting those routes on R1 through rip.
Am i missing something.

R2#show ip route 1.1.1.1
Routing entry for 1.1.1.1/32
  Known via "ospf 10", distance 110, metric 11, type intra area
  Redistributing via rip
  Advertised by rip metric 1
  Last update from 10.10.10.1 on FastEthernet0/0, 00:10:48 ago
  Routing Descriptor Blocks:
  * 10.10.10.1, from 10.10.10.1, 00:10:48 ago, via FastEthernet0/0
      Route metric is 11, traffic share count is 1

R2#show run | section rip
router rip
redistribute ospf 10 metric 1
network 10.0.0.0
no auto-summary


R1#show ip route 1.1.1.1
Routing entry for 1.0.0.0/8
  Known via "rip", distance 120, metric 1
  Redistributing via rip
  Last update from 10.10.10.3 on FastEthernet0/0, 00:00:02 ago
  Routing Descriptor Blocks:
  * 10.10.10.3, from 10.10.10.3, 00:00:02 ago, via FastEthernet0/0
      Route metric is 1, traffic share count is 1


R1#show run | section rip
router rip
network 10.0.0.0
no auto-summary

Chao

Vishwa

2 REPLIES

Re: Split Horizon in RIP

Vishwa,

Split horizon is sure valid for RIP.

This rule is applicable for RIP learned routes only.

But in your case,

Is R2 learning the prefix 1.1.1.1/32 from R0 via RIP ?

If the answer is Yes, then your point is valid.

and

if its No, then the behaviour that you see is correct !

New Member

Re: Split Horizon in RIP

Hi Tharak ,

I read this troubleshooting document ,i am attaching it,something is work or i am not understanding it properly.

Chao

Vishwa

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