I searched online for this, but probably wasn't wording my correction properly. I did find lots of examples, but no why-explanations.
I would like to know that when I have a connection that uses BGP, how do I know if 'd-i o' (default-information orginate) is needed within its BGP? If I have two connections that share the same BGP, how do I know which of those connections needs the 'd-i o' within the configuration? If I move one of the connections that shares the BGP to another router, how do I know if the 'd-i o' command needs to move or stay? Is there something I should look for at the other end of either connection that would tell me "this one needs it"?
Re: When is "default-information originate" needed?
Default-information is nothing more than setting a default route to your neighbors. For example, if Router A is peered with Router B, then Router A can send router B a default route pointing back to itself. In bgp, it would look like this:
Router B would see:
B 0.0.0.0 0.0.0.0 Router A
Not sure about the "level of certification". Reading up on routing in general should help since other routing protocols use this same concept (OSPF comes to mind). So, basically you're telling your neighbor to use you as a default gateway.
You "need" a default route to handle all traffic that the router doesn't know about. When you send traffic to a destination, the router does a lookup to see if it knows about the destination and where/how to send the traffic to get it to it's destination (next hop). If the router doesn't have a match at all, it will use the default gateway that states, "if I don't know how to get here, I'm sending it to my default route in hopes that it knows how to get there."
Ah, the global under the bgp process. That one is used for when you have a default route already in the table via a static route. The default-information orignate only works with a redistribute static, and the static default route must be present. The neighbor command does NOT require an existing default route in the routing table though.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.