default-information originate

[jonk34567]

if i give "default-information originate"  in a router which runs ospf or ripv2 it will advertise a default route

        1.  only  if it has a already configured default route in its routing table 

                                                       or

       2.the router will automatically create a default route and advertise it.

[Joseph W. Doherty]

#1 for OSPF, unless you also add "always".

Don't recall the rules for RIP.

[jonk34567]

what about Rip. rule 2 ? 

[Jon Marshall]

RIP needs default route in routing table. 

Jon

[jonk34567]

i think Rip doesnt need a default route in routing table only ospf needs it.

[Julio E. Moisa · Accepted solution]

Hi,

That is correct, RIP does not need a default route into the routing table to advertise one. OSPF needs one to advertise a default route using default-information originate but if you add the always word it will advertise one with or without entry into the routing table. 

router opsf 1

default-information originate always

:-)

[jonk34567]

thank you very much. your replies are always helpful

[Julio E. Moisa]

Thank you so much! I really appreciate your words.

Have a great day

:-)

[Jon Marshall]

My apologies for the wrong information. 

Thankfully Julio was around to give the right answer :) 

Jon