Maamun, read Edison's link it is all there . but basically when OSPF authentication has been configured on a router the way it works is router authenticates the source of each routing update packets it receives from a neighbor, in other words before learned or advertised routes are exchanged from one OSPF router to another and are participating within the same ospf domain OSPF routers check authentication, if authentication does not match it will not form adjacency and therefore will not receive fraudulent routes from a router unconfigured with same authentication password. It is not the routes that are authenticated.
In simple words, a common problem with RIP is that anyone can bring up a bogus RIP router advertising any route, disrupting routing. By authentication in OSPF, a router would have to be given the correct key before it could join the OSPF routing domain. After then, all OSPF protocol exchanges are authenticated.The OSPF packet header (see Section A.3.1 of RFC 2328) includes an authentication type field.
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.