ospf overrides connected route

[surama123]

Why does an e2 ospf route to a host override a route to a subnet containing that host that is locally connected?

So I have a host connected locally and the subnet appears in the routing table out of the local interface.

OSPF is learning a route to that host out of another interface.

I found it suprising but OSPF overrides the connected subnet, possibly because the route is more specific, ie to a host instead of a subnet.

Any thoughts on this would be appreciated.

[davrojas]

Hello surama,

Is it being override with a lower cost ?

By more specific i would ask: Is the prefix length longer?

Regards,

Pekiro

[surama123]

Thanks for your reply.

Connected route seems to have a cost of 0

OSPF prefix is /32

connected prefix is /28

Ian

[davrojas · Accepted solution]

Hello surama123,

There you go. OSPF prefix is longer than connected.

Longer prefixes are always preferred over shorter ones when forwarding a packet.

Best regards,

DavidNoel

[surama123]

Thanks for your reply DavidNoel,

I'm ashamed to say I didn't know such a basic rule .

All the best,

Ian