Sunday, April 18, 2010

Tricky Question1 - OSPF

Route 1.1.1.1/32 from R1 has been advertised by iBGP to R2 and R3.
On R2 and R3 this BGP route is redistributed into OSPF  using the follwing metrics -

R2 --> E1 metric 100

R3 --> E1 metric 200


R1,R2 and R3 form iBGP neighborship.
R2,R3,R4 and R5 form OSPF neighborship. Area details are given in the diagram.


Question -
Q1. On R5 what will be the next-hop for 1.1.1.1/32? Why? What is the metric of the route?
Q2. What happens if we lower the cost of R5-R4 link on R5 to 1. On R5 what will be the next-hop for 1.1.1.1/32 now? Why? What is the metric of the selected route?