Yes, a book on operational Internet routing issues would be great. For
example, what is SWIP? What is a route registry? In fact, could you answer
those questions here?? ;-)
Priscilla
At 10:44 AM 7/25/00, Howard C. Berkowitz wrote:
>This is a good question, and I'd like to pose a question myself to people
>who read my response. As far as I am concerned, my answers here are at the
>minimum real-world level for Internet routing operations. I draw a
>distinction between Internet routing operations and "BGP".
>
>ACRC was completely useless, IMNSHO, when it came to BGP and the wider
>subject of Internet routing operations. There's a lot of discussion about
>a new emphasis on BGP in BCSN. From talking to some BCSN instructors,
>however, my sense is that the operational issues I describe below are
>_not_ considered in the courseware. Am I correct in that assumption?
>
>Do some current instructors go beyond that level in chalktalks or
>supplementary materials?
>
>Aside from personal curiosity and planning the next BGP paper for
>CertZone, I have the ulterior motive of writing a proposal for an Internet
>Routing book, that is more operational-environment, less configuration and
>protocol mechanics oriented than the books out there now. It would also be
>multivendor (Cisco, gated/rsd, Bay RS, JunOS). I'm trying to figure out if
>these are problems I should write a book to solve.
>
>
>>I trying to add redundency to my network at work (I work for a very small
>>local ISP) and I'd like to run BGP on this router so that if line A dies to
>>upstream provider A, line B will take over to upstream provider B.
>>
>>What is the least requirement for BGP? Someone told me I needed at least a
>>/20 of IP's from ARIN. Someone else told me that I need SWIP instead of
>>RWHOIS. So I'm left wondering exactly what is the minimum overall
>>requirements to run BGP?
>
>BGP itself does not have any minimum requirement. A decreasing number of
>major ISPs, however, filter routes longer than /19 or /20.
>
>If you are homed to at least two upstream providers, with at least T1
>speed, you can generally justify your own AS number. That assignment is
>independent of your address space; you do not necessarily need
>provider-independent address space to get a registered AS.
>
>When requesting an AS, expecting to advertise provider-assigned space, you
>will probably need to document that the provider that is assigning you the
>address space will advertise your more-specific assignment as well as
>their supernet. You will also need to document that your alternate
>provider will advertise this same more-specific block assigned to your
>primary provider, and the primary provider consents to the alternate
>provider advertising it. All this should be recorded in a route registry
>as well as in the AS number application.
>
>As far as the address space, there is a "fast start" procedure at
>ARIN. If an ISP can demonstrate efficient use of a /21, and is growing,
>it can request a "fast start" /20. This /20 will be one half of a /19, and
>you are permitted to advertise the /19 to get through prefix length
>filters. You have to agree to justify the full /19 in 18 months, or
>renumber back into provider assigned space.
>
>Yes, I would agree SWIP is far more widely used than RWHOIS. Check with
>ARIN if RWHOIS is acceptable for documenting your address
>assignments. SWIP and DNS are part of your routing/address management.
>
>>
>>Maybe I don't need BGP? Maybe a floating static route might also work? Please
>>explain and give sample code if possible.
>
>Floating statics can be fine when you have multiple points of attachment
>to a single upstream, but it is much more problematic when connecting to
>multiple ISPs. The key issue is this: how does the secondary provider
>know whether or not to advertise your block if it doesn't have a routing
>protocol to let it know when the route between you is active?
>
>>Thanx in advance,
>>
>>Ken
>>
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Priscilla Oppenheimer
http://www.priscilla.com
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