From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Wed Aug 04 2004 - 14:48:07 GMT-3
At 11:35 AM -0400 8/4/04, McNeace, Roger wrote:
>This would be for a large enterprise network in a multiple hub spoke
>configuration. I want use Private BGP AS's internally and would be
>completely separate from the Ebgp connections to my Transit
>providers. I was thinking EBGP in my core so I could use all the
>different BGP features such as loc-pref, meds etc and also not have
>to worry about full-meshing IBGP or route-reflectors. Ill check out
>the nanog article thanks
That's reasonable for the core. Remember that
confederation-to-confederation is eBGP and lets you use all eBGP
policy controls.
For ease of maintainability, my advice would be to think of your
various policies, preferably specifying them in RPSL, and then define
communities that identify the handling policy for a route. Use route
maps to set MED, loc-pref, etc., based on community. That way, if you
decide you want to change a MED for an AS prepend for a certain group
of routes, it's far easier to find where your configuration needs to
be changed.
>
>-----Original Message-----
>From: James [mailto:james@towardex.com]
>Sent: Wednesday, August 04, 2004 11:19 AM
>To: McNeace, Roger
>Cc: Group Study
>Subject: Re: Enterprise BGP Design
>
>
>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.
>
>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 &
>Bandwidth Services
>cell: 1(978)-394-2867 web: http://www.towardex.com , noc:
>www.twdx.net
>
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