the AD value compares routes that are present in two different routing processes. The router will prefer eBGP to OSPF .. and prefer OSPF route to RIP etc. the iBGP AD value is very high (200) due to the design of BGP which was not meant to work as a internal routing protocol. BGP is designed to be an external routing protocol. So the eBGP is always prefered more than any other besides static or connected which have a value of 1.
to get a iBGP relationship within the Same AS, you need a existing route already in the router. Also the iBGP neighbor never forwards a learned route to another iBGP neighbor unless it is a route reflector.
BGP is an EXTERIOR gateway protocol, meaning its purpose is to move data from networks in one autonomous system to networks in other autonomous systems; unlike the INTERIOR gateway protocols (EIGRP, RIP, OSPF...) whose purpose is to move data within an AS.
So if there's two routes whose metrics match (weight, local preference, locally originated, AS-path length, origin code, and MED), and one of the routes was learned from IBGP and one from EBGP, the EBGP one is used because that gets the data out of the local AS and into the next one; which is the main function of BGP.
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.