news2010a wrote:
In my case, the R4 is announcing the network to the "ISP router R6" using a dynamic routing protocol, BGP.
My conclusion is that I do not need a default-route since I have BGP running.
That said, that means I do not even benefit at all from such 'default-info originate' entry in OSPF, correct? So my conclusion is that I should use 'default-info originate' only when there is no dynamic routing available. Is that correct?
R4#show run | s bgp
redistribute bgp 100 metric-type 1 subnets
router bgp 100
no synchronization
bgp log-neighbor-changes
network 10.2.0.0 mask 255.255.0.0
network 10.177.206.0 mask 255.255.255.0
aggregate-address 10.2.0.0 255.255.0.0 summary-only
aggregate-address 10.177.206.0 255.255.255.0
neighbor 10.2.47.193 remote-as 200
neighbor 10.2.55.133 remote-as 200
neighbor 10.2.255.15 remote-as 100
neighbor 10.2.255.15 update-source Loopback0
no auto-summary
R4#
Marlon
You would benefit from using "default-information originate" if you had other OSPF speaking routers that you wanted to receive a default-route. If all your routers are receiving a default-route via BGP or they do not need a default-route then you do not get any benefit from it.
Your conclusion that you should use "default-information originate" only when there is no dynamic routing protocol available is confusing because OSPF is a dynamic routing protocol. Do you mean any other dynamic routing protocol other than OSPF. Even then you may benefit from it if you have routers that only use OSPF.
As for when to the "always" keyword and when not to. Well if you did not have any other routing protocol providing a default-route and you did not have a static default-route the "always" keyword would still allow OSPF to send a default-route to other OSPF speakers. If you miss off the "always" keyword then there has to be a default route supplied to the routers before OSPF would genearate one to other OSPF speaking routers.
Jon
