Below is my topology. I have a very basic OSPF setup and every layer 3 switch sees every network on 'sh ip route', and every advertising router is known in the ospf database. If I try to do a traceroute from DN1 to VLAN2000 hosted on DN2 or its loopback, here's the output I see.
DN1_Lab#traceroute 10.10.2.1
Type escape sequence to abort.
Tracing the route to 10.10.2.1
VRF info: (vrf in name/id, vrf out name/id)
1 5.5.5.9 2 msec
5.5.5.1 2 msec
5.5.5.9 2 msec
2 *
5.5.5.14 2 msec *
As shown above, the traceroute bounces between the two CNs and both routes have a cost of 2. Oddly, if I do a traceroute to 5.5.5.14 on DN2 from DN1, there's no bouncing between the CNs.
DN1_Lab#traceroute 5.5.5.14
Type escape sequence to abort.
Tracing the route to 5.5.5.14
VRF info: (vrf in name/id, vrf out name/id)
1 5.5.5.9 2 msec 2 msec 1 msec
2 5.5.5.14 1 msec 2 msec *
Something odd about this network is that every single interface is a layer 2 interface.. The "point to point" vlans are trunked across but they still participate in OSPF. I'm not sure if this is causing some spanning tree issues which would explain the bouncing between CNs.
My previous comment was not clear hope you this time clear I config the cost equal in all interface
see how R1 receive the 20.0.0.0 and 130.0.0.0 from R4
