Hello,
@NetworkMan23 wrote:
is it correct to go R1 - R2- R3 -R4?
No. If this is pure IP forwarding (no MPLS and no tunnels of any sort: GRE, IPIP, IPSec etc) then when packet destined to R4 hits R2, then R2 has 2 choice routes:
- INTRA area 10 route from R4 via R5
- INTER area 0 route from R3
According to RFC 2328 section 11, INTRA area route is preferred and R2 will send this packet to R5 and R5 will forward to R4.
HTH
Thx
Alex