From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Wed Aug 04 2004 - 13:32:21 GMT-3
At 11:19 AM -0400 8/4/04, James wrote:
>On Wed, Aug 04, 2004 at 11:06:17AM -0400, McNeace, Roger wrote:
>> Anyone know of any good links to case studies that implement OSPF
>>and BGP in an enterprise network. I have already read the case
>>studies in the book "Large-Scale IP Network Solutions". Just
>>trying to decide whether to use IBGP or EBGP for my enterprise
>>core. Any tips would be apreciated.
>
>Depends on the definition of enterprise I suppose.. If you want to build the
>backbone level with similarity to a service provider backbone (for example a
>large enterprise network backbone), then go to www.nanog.org and in
>the previous
>nanog meetings, Philip Smith from Cisco has some excellent presentations about
>SP BGP configuration with a few sample configs and a case study.
Phil Smith and Barry Greene do have a book on the subject, Cisco ISP
Essentials. I also have NANOG presentations and two books in this
area, the books coming at the problem a little differently: one, WAN
Survival Guide, is more oriented to the enterprise interface to the
carrier, and the other, Building Service Provider Networks, is the
complement at the provider side of the network.
As James suggests, the line between complex enterprise and service
provider can get blurry. For example, with one multinational
enterprise that was extremely distributed, the policy requirements
were such that each region needed to be a confederation AS, typically
associated with one IGP domain, and then there was a
backbone-of-backbones with the main AS number. Since there was
connectivity to ISPs all over the world, there was some connectivity
directly from confederation AS. Depending on the specific
requirements, the confederation could be a registered AS number, use
the main number, or use a private ASN.
>
>IMHO, I'd use IBGP at the core. Run EBGP with upstreams, and any downstream
>sites requiring bgp hookup to the backbone.
>
>HTH,
>-J
>
>
>--
>James Jun TowardEX
>Technologies, Inc.
>Technical Lead Network Design, Consulting, IT
>Outsourcing
>james@towardex.com Boston-based Colocation &
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>
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