Dual ISP load balancing design with ibgp peering

[icabrera]

Hi, I've been working on a dual router with dual ISP load balancing  (unequal bandwidth) design.

We have our own block of public IP address range with an AS number and the design is like:

ISP_1         ISP_2

   |                 |

   | eBGP       |eBGP

   |                 |

   |     iBGP    |

RTR1 -- ----  RTR2

   |                 |

   \iBGP       /iBGP

    \             /

        RTR3

           |

We wanted to implement traffic engineering at the edge routers (RTR1, RTR2): AS-path prepending, preference and we'll have full-routing at our routers

But today we've been informed the two IPSs are going to use the same AS so we have to use iBGP peering with them. 

ISP_1         ISP_2

   |                 |

   | iBGP       |iBGP

   |                 |

   |     iBGP    |

RTR1 -- ----  RTR2

   |                 |

   \iBGP       /iBGP

    \             /

        RTR3

           |

Any advice about the design with this new requeriment?

Thanks.

[Edison Ortiz]

Why would the ISPs use your AS? Don't you own it?

[icabrera]

Well, the AS is not really ours, the AS belongs to our customer,who is the one has reached agreements with the two ISPs and they've decided to do it that way. That's the reason why we need to know the technical implications of this decision, we would really appreciate any comments or thoughts about it.

Thanks

[argnetworking]

So, the provider is going to own your borders bgp routers?, why do you (or your customer) want to do that?

The fun of having your own AS is to control everything.

Is there any particular reason to do it that way?

[icabrera]

I can't agree more with you, but at this moment I don't have the information about why this decision has been taken. I'll try to find it out next week but in the meantime I'd like to see the technical implications, I mean, is there any way of having this control?, I can't see how, any ideas?

Thanks