"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.
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.
> 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]
> >
>
>
> -----------------------------------------------
> 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
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=3999&t=3831
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
