On Thu, 10 May 2001, andyh wrote:
> "Brian" wrote:
>
> > On Wed, 9 May 2001, Brett Johnson wrote:
> >
> > > If I acquire an AS number and use it with two providers what happens if
> in
> > a
> > > year or two
> > > I decided to change one of the providers. Do I have to inform ARIN or
> > > acquire a new AS
> > > number? What would be the process of informing the Internet (through
> BGP)
> > > when changing
> > > the ISP? How about if I added a third ISP instead of changing ISPs?
> >
> > The AS is yours forever.
> >
> > You do not inform the Internet, you simply drop the one transit provider,
> > and bring a BGP session up with the new one..........
>
> oh yes you do - you'd better get your routing policy registered with the
> appropriate registry, else ain't no way the Tier-1s are going to accept
your
> routes.
Andy andy.........this just isn't so (In the US). A few upstreams require
RR's, but definitly less than half of all Tier1's in the US. For example,
UUnet does not require, neither does Sprint, and those are probably the
two largest transit providers in the USA. ATT and CW however, do require.
Yet Global Crossing and Qwest do not.
>
> As a matter of security the big ISPs (and the clueful smaller ones) build
> prefix filters based on your registered routing policy from e various
> registries - ARIN, RIPE, APNIC, etc. based on scripts run against the whois
> databases.
>
> > If you add a third transit AS, then you just bring up a session, then
when
> > you announce via that new provider everyone will be aware it is a path to
> > you. BGP is quite simple as far as making changes and adds like that.
>
> true to an extent - you canannounce what you like, where you like, but
don't
> expect anything like global routability if you haven't got that routing
> policy sorted.
We do it all the time. In the last year alone we have switched various
links between uunet (701), sprint (1239), qwest(209), cw(3541?), and
global crossing(3561?)...........and I mean, no RR, no nothing, I can turn
them up and down as I please...............Its definitly alot looser in
the states, although I do generally like the whole RR concept.
>
> > Now changing your AS.......well, that can get ugly if you have lots of
> > peers and stuff going on :)
> >
> > Brian
> >
> >
> > >
> > > Thank you
> > >
> > > Brett Johnson
> > > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> > >
> >
> >
> > -----------------------------------------------
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> >
> > Brian Feeny,CCDP,CCNP+VAS Scarlett Parria
> > [EMAIL PROTECTED] [EMAIL PROTECTED]
> > 318-213-4709 318-213-4701
> >
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-----------------------------------------------
We have MOVED!! Make note of our new address!!!
I'm buying / selling used CISCO gear!!
email me for a quote
Brian Feeny,CCDP,CCNP+VAS Scarlett Parria
[EMAIL PROTECTED] [EMAIL PROTECTED]
318-213-4709 318-213-4701
Netjam, LLC http://www.netjam.net
333 Texas St. VISA/MC/AMEX/COD
Suite 1401 30 day warranty
Shreveport, LA 71101 Cisco Channel Partner
p: 318-212-0245
f: 318-212-0246
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