RE: Peering best practices advice needed.

["Ejay Hire" <ejay.hire () isdn net>]

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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