bgp router with multi asn's - neighbor config ?

[Kai]

G'day!

For the configuration we want to set up, I couldn't find any details in
the docs, the wiki or the list archive. So please allow me to ask my
questions here (questions see below).

desired setup:

We want to establish a router ('A') announcing two different ASNs
(as1,as2) to it's neighbours. In fact we want to setup three routers A,
B and C, all of them corporately announcing as1 and as2.

I'd guess the config on router A should include some lines like these:
 protocol bgp {
   local as <as1>;
   neighbor X as as9;
   (...)
 }
 protocol bgp {
   local as <as2>;
   neighbor X as as9;
   (...)
 }
X being one of the neighbours and announcing as9.

Question 1: Is this basically the correct approach?

Question 2: What would be the correct config on router X (A's neighbour)
in this setup? Would it look like:
 protocol bgp {
   local as <as9>;
   neighbor A as as1;
   (...)
 }
 protocol bgp {
   local as <as9>;
   neighbor A as as2;
   (...)
 }

Question 3: Does anyone have a pointer to a text/tutorial/whatever that
explains in detail what config is needed for this kind of setup? 

Best regards, Kai

-- 
"Das ist Demokratie, wenn man sich aussuchen darf, wer einen verarscht."
                                                               (Hagen Rether)
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