Velocity Reviews - Re: iBGP question.

On 8 Lip, 00:27, Merv <merv.hr...@rogers.com> wrote:
> On Jul 7, 1:56 am, Jarek Jarzebowski <jarek.jarzebow...@gmail.com>
> wrote:
>
>
>
> > On 7 Lip, 07:40, "Bartosz Gagat" <bl...@poczta.onet.pl> wrote:
>
> > > If possible- use full mesh. If not -use other techiques- like route
> > > reflector or confederation.
>
> > > Bartosz Gagat"Jarek Jarzebowski" <jarek.jarzebow...@gmail.com> wrote in message
>
> > >news:7cb3b19f-5ec9-45b7-98cc-619e51470017@a70g2000hsh.googlegroups.com...
>
> > > > Hi all,
>
> > > > I have AS and own PI prefixes. I have 2 BGP routers in different
> > > > locations (A and B). Router A announces some prefixes and B announces
> > > > another prefixes. Between routers A and B is iBGP session (direct
> > > > leased link connecting those two routers).
>
> > > > Now I have to launch third location C with another BGP router within
> > > > same AS.
>
> > > > Do I have to make full mesh iBGP connections between routers A,B and C
> > > > (I mean dedicated direct links) or may I use some other techniques
> > > > like tunnels, or whatever, to establish iBGP connections?
>
> A more fundamental question - why do you need to run BGP to existing
> site ?
>
> Do you not just need to run an IGP (via GRE tunnel( for inter-AS
> traffic ?

I have 2 locations (2 routers BGP using the same AS): A and B.
On each site I have separate BGP upstream links to at least 2 peers
(on each site), so in fact, those routers are using the same AS but
are announcing different prefixes. I just have done my internal
assignement: prefix X is used in location A, and prefix Y in B.

It's done this way to provide my customers Internet using my PI
adresses on each location. Now, because routers A and B use the same
AS, so, I need iBGP session to reach prefix X (announced by A) from B,
and vice versa. My AS is'nt big enough to make some internal traffic
policy so I just need some way to reach my prefixes between sites.
Unfortunetly, I have very poor direct leased link between those
sites.

I have to change it, and I am thinking of alternative solutins, for
example:
- make iBGP session between A and B using GRE over Internet (if
possible)
- use allowas-in to receive prefix X on router B through foreign peers
(normaly BGP blocks prefikses originated from own AS).

I don't know if my english is precise enough but I tried to explain
situation as good as I can.
The question is: "what solution is better?"

Regards,
Jarek