From: Dan.Thorson@seagate.com
Date: Wed Nov 20 2002 - 17:55:41 GMT-3
I would recommend that your provider use as-path prepend to place your AS
in the path for your routes.... then the routes appear to be originating
from your AS (until such time as you start announcing yourself).... I use
this in my lab to create a false "Internet" with arbitrary AS path lengths
(it's handy for playing with as path filters, etc).
danT
If your provider is AS999, and your provider's upstream is AS 2, and your
AS is 111 and you want to announce 172.16.5.0/24....
router bgp 999
neighbor 144.144.144.4 remote-as 2
neighbor 144.144.144.4 route-map ASPATH out
network 172.16.5.0 mask 255.255.255.0
!
ip prefix-list LIST5 seq 5 permit 172.16.5.0/24
!
route-map ASPATH permit 10
match ip address prefix-list LIST5
set as-path prepend 111
route-map ASPATH permit 20
!
ip route 172.16.5.0 255.255.255.0 <your router>
The beauty of this is when you start peering with your upstream, he doesn't
need to change his
========================================
Dan Thorson - Seagate Technology, LLC
desk +1 (952) 402-8293 fax +1 (952) 402-1007
SeaTel 8-402-8293
========================================
"Casey, Paul
(6822)" To: ccielab@groupstudy.com
<Paul.Casey@o cc:
2.com> Subject: Real world problem
Sent by:
nobody@groups
tudy.com
11/20/2002
06:12 AM
Please
respond to
"Casey, Paul
(6822)"
Hi,
Our provider is advertising out routes for us into a BGP network.
We are using there AS number currently to advertise the routes.
We are currently not using our own as number to advertise the routes but we
have an AS number and are planning to run BGP soon.
In the mean time other downstream providers have spotted this, based on
filters they have and are starting to ask questions why we are NOT using
our
own AS number, One provider has refused to accept these routes until they
come from our own as number.
In the interim period until we start using our own as number is there
anyway
we can work with our provider to prepend our as number on to there, so
other
providers will not have an issue and other new providers will not be aware
of this current difficulty.
Kind regards.
Paul.
Paul Casey
O2 Ireland
Core Network Eng'g Team
76 Lower Baggot Street, Dublin 2.
> * Mob : +353 86 8143310
E-mail: paul.casey@o2.com
PLEASE NOTE THAT THE ABOVE IS CONFIDENTIAL INFORMATION I
> See what you can do www.o2.ie
>
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