[c-nsp] Dumb question

[Ziv Leyes]

Hi all,
I have the following scenario (excuse my lousy ascii art...)



                                           ISP1
                                         /
                                       /
                                     /
RTR1 -----iBGP----- RTR2
                                    \
                                      \
                                        \
                                         ISP2

For the simplicity of the case, I have two prefixes, 1.1.1.1/24 and 2.2.2.2/24,
I want to advertise prefix 1.1.1.1/24 to ISP1 as best, and 2.2.2.2/24 to ISP1 with prepends, and the opposite too, prefix 2.2.2.2/24 to ISP2 as best and prefix 1.1.1.1/24 to ISP1 with prepends.

What I'm trying to do is to set up all in a way that the only place I set up my decision is on RTR1 only, and that will be reflected via the iBGP to RTR2 about how I want the prefixes to be advertised to my eBGP neighbors ISP1 and ISP2
I tried setting communities, but all I got is RTR2 to see and match the communities, but based on this, I couldn't get the prefixes advertised to the ISPs at all.

What kind of manipulation I need to do in order for the RTR2 after matching the communities coming from RTR1, to advertise it to the ISPs according to the priorities I've mentioned before?

This sounds very basic and not so complicated to do, but I guess I'm missing something here!

Please help, and if possible, don't send me links to cisco web site case studies or to some 300 pages PDF about how BGP and communities work. A simple straight forward example of how this can be set will be enough.
Thanks!
Ziv

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