Internet Routing Architecture - by Bassam Halabi - ISBN 1562056522
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>From: Dan West <[EMAIL PROTECTED]>
>Reply-To: Dan West <[EMAIL PROTECTED]>
>To: "Howard C. Berkowitz" <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>Subject: Re: BGP question
>Date: Fri, 30 Jun 2000 09:41:50 -0700 (PDT)
>
>This BGP gizmo looks rather intriguing...Can anyone
>recommed ONE comprehensive, well-written book on iBGP
>and eBGP?
>
>Many thanks. ( from myself and elgrande.com)
>
>
>--- "Howard C. Berkowitz" <[EMAIL PROTECTED]> wrote:
> > >Sounds like you guys were doing IBGP...
> >
> >
> > Could be, but there are several other explanations.
> >
> > Let me go into the underlying rationale. According
> > to RFC1930, which
> > is a must-read in understanding BGP, an AS is a set
> > of addresses and
> > routers, under one or more administrations, that
> > presents a common
> > routing policy to the internet. So, if Dan's
> > employer had Internet
> > connectivity only through the provider, the customer
> > would logically
> > be part of the provider's AS.,
> >
> > Providers are usually reluctant to let customers
> > have access to their
> > iBGP. You will see cases where the provider
> > controls an iBGP router
> > at the customer premises.
> >
> > More likely, the provider assigned a private AS
> > number to the
> > customer, and either made it part of a confederation
> > or used a rather
> > undocumented Cisco feature called remove-private-as.
> > By doing this,
> > you have all the power of eBGP policy controls, but
> > you don't burn a
> > registered AS number.
> >
> > I'd like to throw out a related question to people
> > that recently have
> > taken BGP in a Cisco course, or in certification
> > tests. On this
> > list, the term "advanced BGP" is used a good deal in
> > relation to the
> > new material. It had been my experience that the BGP
> > in ACRC was so
> > oversimplified as to have no relationship with
> > anything one would see
> > in the ISP world. In particular, there was
> > handwaving about
> > "policies," but very little about why one has
> > policies or how they
> > are enforced -- just the urban legend that "BGP
> > carries policies."
> >
> > I'm doing a series of tutorials on BGP at
> > certificationzone.com, the
> > second of which is in the free area of the CCIE
> > zone. To me, they
> > are at the "BGP 101 or BGP 102" level in terms of
> > real-world Internet
> > operations.
> >
> > Within what people can say within NDA, are complex
> > AS path
> > expressions being considered? QoS policy setting
> > based on AS
> > path/address/community? Hierarchical route
> > reflectors? The flavors
> > of hard and soft refresh? Load-sharing policies?
> > Cold potato routing?
> > etc., etc., etc....
> >
> > What topics that people are seeing in BGP course
> > material or tests on
> > which you'd most like additional tutorials?
> > Unfortunately, I don't
> > approach this topic through the eyes of a person
> > starting with the
> > technology.
> >
> > >
> > >-B
> > >"Dan West" <[EMAIL PROTECTED]> wrote in message
> >
> >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > My former employer (an ISP) had BGP peering
> > with our
> > > > upstream provider(Telco). As I understand it so
> > far,
> > > > BGP4 is used to advertise routes between
> > autonomous
> > > > systems. One day I ran a web-based traceroute
> > to my
> > > > old haunt and it showed them having the same
> > > > autonomous system number as our bandwidth
> > provider.
> > > > Were we unnecessarily using BGP? I don't
> > understand
> > > > why our telco and we (the ISP) had the same AS
> > number.
> > > >
> > > >
> > > > Am I misunderstanding the purpose of the AS
> > number in
> > > > BGP?
> > > >
> > > > Many thanks.
> >
> > ___________________________________
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>
>=====
>Dan West -- CCNA
>
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