RIPv1 -RIP v2 and Summary to Null - Scenario!

From: Hossam (sam6626@yahoo.com)
Date: Sat Jan 24 2004 - 20:49:22 GMT-3


Team,
Assume we have R4 and R2. R4 MUST run RIP v.1
 
R4 is conneceted to the backbone via Ethernet with subnet 10.1.4.0/22.
 
R2 is connected to the rest of the network form one side. And to R4 via a FR link (with Split horizon on both sides.) from the other side.
 
Diagram:
 
  ALL ROUTERS -- R2 --- FR --------R4 ---- BB1(10.1.4.4)
 
 
R2 is runnning Rv2 with "no auto summary". R2 is recieving v1 updates from R4. R2 is sending v1 and V2 updates to R4.
 
Due to auto summary on R4, i am getting 10.0.0.0/8 in R2 RIP v.2 database. Having this route on R2 is a must for the rest of the routers (connected to R2) to reach the backbone.
 
For the scenario requirment i need to configure a static summary route to "10.2.4.0 255.255.252.0" to a null interface on R2.

Strangly, Once i configure this summary to null on R2, the classful summary of 10.0.0.0 learnt from R4 is deleted form R2 Routing table!!!

Using debug i know that R4 is still sending the 10.0.0.0 to R2. R2 Recieves the route but it stops updating it database with it??

Does anyone know an explanation??

Note: Router 2 is runnig IOS 12.2

Thanks

SAM

 

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