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need some help with a issue we faced in the network , we deleted IBGP and OSPF between Router 2 to to Router 5 , after which router 2 didnt had router present for 126.96.36.199. and we started to have traffic from Router 1 (source 188.8.131.52) ECMP'ed toward 184.108.40.206 , next hop Router 2 and Router 3 as OSPF costs matched , which cause intermittent outage.As when the packets reached router 2 , there was no route present for 220.127.116.11 and traffic started to loop between router 1 and router 2. While the packets which were sent via Router 3 were fine.Is there any way we can over come this issue, any feature which could help in this , dont want to add static routes
Updated the diagram , in terms of routing table
on R1 -BGP Route present for 18.104.22.168/32 next hop Router 2 (before the cutover)BGP Route present for 22.214.171.124/32 next hop Router 2 +Router 3 (After the cutover,ECMP due to equal cost)R2BGP Route present for 126.96.36.199/32 next hop Router 5 (before the cutover)BGP Route NOT present for 188.8.131.52 (After the cutover)the trace route from R184.108.40.206 -->R1-->R2---(Following bigger subnet 220.127.116.11/24)
---->R1---(OSPF Cost equal between R2 and R3)---> R2 -->R1(loop)