[76387] in North American Network Operators' Group
RE: Peering best practices advice needed.
daemon@ATHENA.MIT.EDU (Ejay Hire)
Wed Dec 8 21:31:12 2004
From: "Ejay Hire" <ejay.hire@isdn.net>
To: "'Rolo Tomassi'" <rolotomassi32@hotmail.com>, <nanog@merit.edu>
Date: Wed, 8 Dec 2004 20:27:03 -0600
In-Reply-To: <BAY17-F259483B1EB2E37F86F5478AEB60@phx.gbl>
Errors-To: owner-nanog-outgoing@merit.edu
Hello.
Three options.
1. Acquire a second ASN, and announce each site's /19 from
a different asn.
2. Announce each locations /19 from it's respective
location, using the same asn.
Use the cisco BGP command Allow-as-in to permit each AS to
hear the remote site's network advertisement.
3. If the remote site will not be multihomed, ask their ISP
to announce the /19 for you.
My gut says that if you are advertising a block in the
territory of another RIR, your irr entries will need to be
correct to save filtering issues.
Good Luck,
Ejay
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]
On
> Behalf Of Rolo Tomassi
> Sent: Wednesday, December 08, 2004 11:04 AM
> To: nanog@merit.edu
> Subject: Peering best practices advice needed.
>
>
> Hi all,
>
> Please forgive the simplistic nature of the query..
>
> Basically my company is multi-homed with 2 different
> providers in the UK,
> and advertising a /18. Now some colleaguges in another
part
> of the world
> want to break that /18 into two /19's and advertise one
/19
> and we advertise
> the other. This is fine, however we are NOT running IBGP
in the core,
> therefore the UK customers in the /19 will not be able to
> reach the other
> /19 as there would be a loop detected through EBGP.
>
> Now someone mentioned that we could use AS-LOOP-IN feature
which will
> overcome this problem and allow us to route to each other
via
> EBGP. I really
> think this is a bad idea but until we get an internal link
-
> I dont see a
> way forward. So... anyone doing this currently in their
> network or have any
> "best practices" way round this. I want our company to be
> good Netizens but
> still be able to pass traffic between the 2 /19's.
>
> Any help would be greatly appreciated.
>
> Rolo !
>
>
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