OSPF Default Originate

Hi all,

I was doing some practice in setting up OSPF in a NBMA network, and when I want to propagate a default route (that has a exit interface instead of a next hop IP) across to other routers connected in the same broadcast domain, it doesn't work. Rather, if I use the next hop IP address, the route gets propagated to the other routers. Why is it like that?

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Comments

networker050184

It should still work either way. Are you sure you are generating the default route correctly when adding it to an exit interface? Does the local router show the route in the table?

BobNakamura

Funny thing is that when I apply the default route to the router, it doesn't even show up on the routing table

mdomino

That's why it isn't propagating, then! If the router you're adding it to doesn't have it then it sure isn't sending it out.

If you're just starting to work with OSPF make sure you didn't accidentally use a wildcard instead of a subnet mask when adding the route.

ip route 0.0.0.0 0.0.0.0 <interface> just worked for me and propagated through my OSPF lab.

d6bmg

BobNakamura wrote: »

Funny thing is that when I apply the default route to the router, it doesn't even show up on the routing table

In that case you need to have an actual interface which would be assigned to that IP address of default route. Otherwise it won't show up in the routing table.

BobNakamura

Surprisingly enough, I re-did it and it worked. Haha looks like theres a glitch in Packet Tracer.

Thank you!