Brian,
what are we trying to do here - what we can get away with, or best pratice?
I would put it to you that the routes you advertise in this manner are *not*
globally routable - this is probably not as pertinent in the States as here
in Europe, where the traffic tends to be non-inter-contiental. However I
guarantee you that the providers you mention filter routes from Europe and
other non-US origins - I have had trouble propagating routes to the US via a
number of the mentioned providers (whom I have used as US-transit in the
past), where the policies have not been *absolutely* spot on - generally
where a downstream has messed up their portion of the deal. I would think
that some of your routes do not fully propagate across EMEA and Asia,
although this would be of less concern than Europe being able to
back-propagate to the US.
Your comments do beg the question as to why historically the major US
transit prividers have on occasion had global routing tables, which in turn
have been advertised to downstreams, 50% above the size of the "real" table
size
Fair enough, perhaps conditions are not so rigourous in the states, but over
here it is necessary to take a little care with one's RIPE-181/RPSL policies
and get them registered correctly.
Andy
----- Original Message -----
From: "Brian"
To:
Sent: Thursday, May 10, 2001 9:58 PM
Subject: Re: Changing ISPs [7:3831]
> 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:
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> > > >
> > >
> > >
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> > > Brian Feeny,CCDP,CCNP+VAS Scarlett Parria
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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
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
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