Hello,
Just a few comments:
On the topology picture ISP1 should have .4 on Gi0/1.
Also the behavior for RIP is a bit different than OSPF related to default-information originate.
Default route is injected in RIP updates although there is no default route configured on DUT that does default-information originate. Not sure yet if this is a bug or wanted behavior…
So the note “The default-information originate command only works if you have a default route in your own routing table.” is not mandatory.
Many thanks,
Stefanita