Supposing to have IBGP to one ISP (to avoid assigning of independent AS) and EBGP to the second ISP, again will my router announce the /24 inside of the first ISP address block to the EBGP peer ??
Interesting approach. In general, the ISPs I know would be reluctant to run iBGP with a customer, unless they had total control of all BGP speakers. If I understand you correctly, the enterprise would have to tag its advertisements to the second ISP with the ASN of the first, since the enterprise doesn't have its own. Again, I think most ISPs would be reluctant to give up this amount of control.
Without the ISP having total control over the customer router, a misconfiguration of filters on the customer side could easily cause the customer to be a valid (and 1 hop) path in the tables from ISP A to ISP B. Doesn't sound like a possibility I would be willing to have hanging over my head. --- -=<:gEm:>=- -<sMp>-<sMp>-<sMp>-<sMp>-<sMp>-<sMp>-<sMp>-<sMp>-<sMp>-- Gordon Mercer -=<Dedicated>=- [digitalNATION] 703 642 2800 -=<Servers>=- gmercer@dn.net <::>=-=<::>=--=<::>=-=<::>=--=<::>=-=<::>=--=<::>=-=<::>