If you own the AS with R1, R2, R3 and R4 then you are free to use any addressing you want. However you say -
R1, R2 and R4 announce some prefix to each router of my AS
What about R3, do you not want routes from your AS to be advertised to R3 as well and routes received via EBGP on R3 to be advertised within your AS ?
It's also not clear from your diagram where the IBGP sessions are. If each router is peering with only directly connected routers using IBGP (within your AS) then you will run into the IBGP restriction of a route learnt from an IBGP peer cannot be advertised to another IBGP peer.
So R2 could learn a route from R1 via IBGP but it would not be able to advertise this to R4 via IBGP. Similarly R4 advertises a route via IBGP to R2, R2 cannot then advertise that route to R1.
The way round this is either -
1) create IBGP session between each router ie. a full mesh. Ideally this would be done over dedicated links but you can do it via other routers but if you do this a failure of one router can disrupt more than one IBGP session.
2) use route reflectors and clients eg. R2 could be a route reflector and R1 and R4 clients and then R2 could receive a route from R4 and advertise to R1 and vice versa.
I would use private IP address for connecting routers between them to reduce the public ip address loss. Technically it will work, but I don't know if it's a good practice or not.
To be honest i don't know whether there is a best practice for this. If you need to preserve IP public IP addressing then it makes perfect sense to me to use private addressing for internal connectivity that you are not advertising anyway.
As long as it is working i cannot see the advantage of using up public IPs when you do not need to.
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.