I have a similar question, we're an ISP with our own ASN and we're
multihomed to two Tier 1 providers, we'll call them ASN10 and ASN20. We
have a customer that wants to use ASN20 symmetrically for their traffic
while having ASN10 available in case of a failure. Would this be
accomplished using
You'll probably need to use as prepends to control traffic in both
directions from the ISP side...
To control user's OUTBOUND traffic patterns:
On the BGP connections to these users, for any of the less preferred routes
(from AS2 and AS3), you want to
Howard C. Berkowitz wrote in message
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At 12:30 AM -0400 5/12/02, Erwin wrote:
Suppose we are the ISP having 3 different AS connected to users for
multihoming. If it is requested that the users prefer a particular path,
say
from AS1, instead of from
that AS1 was originally BBN, which only
makes sense, since they are at least partially to blame for all of this fuss
over data connectivity in the first place.
- Original Message -
From: Chuck
To:
Sent: Sunday, May 12, 2002 2:50 PM
Subject: Re: BGP Multihoming Policy [7:43962]
Howard C
At 2:50 PM -0400 5/12/02, Chuck wrote:
Idle curiousity - in cases like AS 2, if the buying ISP already has an AS
number, do they get to keep the one acquired in the purchase? Or does ARIN
require that to be relinquished? Probably not, meaning that worlCom must
have about a dozen AS numbers,
on the user's router you'll want to have them apply a route-map to routes
from AS1 that sets the local pref to 200 (or something higher than the
default of 100). Those routes will then be used over any from the other AS's
for outbound traffic from that user.
If the user wants to control inbound
Thanks a lot, Rob for your answers.
Is it possible to apply those policies in the ISP routers, rather than in
users' routers. If so, which attributes are the most appropriate ?
Rob Ehlers wrote in message
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on the user's router you'll want to have
At 12:30 AM -0400 5/12/02, Erwin wrote:
Suppose we are the ISP having 3 different AS connected to users for
multihoming. If it is requested that the users prefer a particular path, say
from AS1, instead of from AS2 or AS3. What is the best way to apply the
configuration? Is it using BGP path
Well, obviously, the users are connected to the ISP private ASNs. There are
three of them and I would like to control the exit to my upstreams but I
prefer to configure the BGP attributes in my local routers, instead of doing
it in the remote routers at the user ends.
Currently, all the users
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