Thanks for the information. Just for other readers
note, BGP is not included in Routing TCP/IP...that's
why I asked about BGP specifically. ;)
--- "Raymond Everson (Rainman)" <[EMAIL PROTECTED]>
wrote:
> There are TWO, and ONLY two books comprehensive
> enough to be referred to
> as the "burning bush" of BGP... the more
> understandable, readable is:
>
http://www.amazon.com/exec/obidos/ASIN/1578700418/qid=962457671/sr=1-2/102-1944739-3768950
>
> The classic tech library is not complete however,
> without THE Bible of
> BGP, written by the guy most influential in BGP
> deployment, Bassam Halabi
> ("Sam"):
>
http://www.amazon.com/exec/obidos/ASIN/1562056522/qid=962457981/sr=1-1/102-1944739-3768950
>
> .... which is soon to be followed by it's Second
> Edition...
>
> Please do not accept any substitutes, no kidding.
> R/
> Rainman
>
> Dan West wrote:
>
> > 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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=====
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