[isp-bgp] Smaller ISP Network Design Question

[Anthony Guida <imdacrazy1@...>]

Hello -

I work for a smaller ISP which has 2 offices in different
locations in the midwest region. We currently get all of
our upstream access through our CHI office which is multihomed
to 2 different ISPs. But in the next month we will be disconnecting
one of the ISPs in our CHI office and adding one to our DNV
office. So we now will have 2 different exit points in our network.

I would like to have a network constituted with 4 routers,
2 Edge and 2 Core routers connected on iBGP, and each Edge
router is connected in eBGP to ISPs (ISP1 and ISP2).
This is what I have in mind so far:


CHI Edge Rtr 1-------ISP 1 (Announces own /21)
 |
 |
CHI Core Rtr 1
 |
 |
 iBGP
 |
 |
DNV Core Rtr 2
 |
 |
DNV Edge Rtr 2-------ISP 2 (Announces own /21)

The question I have is whether or not this is a good design?
Currently the DNV Core router is sending all of its upstream traffic
to the CHI Core Rtr and then over to the CHI Edge and out to the Internet.
The DNV Core router is barely being utilized and now I am getting pressed
by my directors to add an Edge router to the DNV office so we can have a
similar setup as our CHI office. I am not sure if this design will provide
us with more redundancy or just an extra hop each packet has to take. One
more thing to note, the CHI Edge will only handle CHI upstream traffic
and the DNV Edge will only handle DNV upstream traffic. If ISP 2 were to
go down, all traffic would be routed through ISP 1 and vice-versa.

Please advise and any suggestions will be appreciated.

Thanks in advance,
Anthony






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