Re: [isp-bgp] BGP announcement question

[Marshall Eubanks <tme@multicasttech.com>]

I would just pay the money and get a second AS.

Regards
Marshall

On Feb 28, 2007, at 2:50 PM, James Jun wrote:

> Well one thing you need to be worried about is communication  
> between Sites A
> and B. If you are using same AS number, BGP's loop detection will  
> reject
> hearing of Site B's prefixes/route announcements at Site A and vice  
> versa.
> (Though if you take last resort default route from your upstreams,  
> that is
> not exactly a problem with exception of lack of sufficient NLRI  
> information
> for diverse route selection)
>
> You can overcome this by using 'allowas-in' on your transit neighbor
> sessions to your uplink ISPs, but such hack should always be  
> temporary and
> be well documented as it can also create other event-specific  
> problems for
> networks with changing topology in the future.  Another option  
> available to
> overcome this without using that hack is to apply for another AS  
> number from
> ARIN.  ARIN policies do allow acquisition of more AS numbers if you  
> have
> different sites multihomed while maintaining their own routing  
> policy (in
> other words, disconnected island POP's multihomed to separate ISPs  
> at each
> location, not connected by a transport).
>
> Lastly, you can also buy transport (which is costly or moderately ok
> depending on locations involved) or setup a GRE tunnel if inter- 
> site traffic
> is minimal or manageable to handle through tunnel link.  In such case,
> ensuring that your transit links can handle more than 1500 bytes of  
> MTU
> would help, as 1476 MTU based GRE tunnels are royal pain.
>
> Regards,
> james
>
>
> -----Original Message-----
> From: Jim Barstow [mailto:jimb-clec@dssitech.com]
> Sent: Wednesday, February 28, 2007 2:41 PM
> To: isp-bgp@isp-bgp.com
> Subject: RE: [isp-bgp] BGP announcement question
>
> I am aware of this.. Site B is to be multihomed to help prevent  
> this, as
> currently a link from Site A to Site B is not yet feasible.
>
>
> ------------------------------------
> SmartTel Communications
> Jim Barstow
> Sr. Telecom Engineer
> jimb@smarttelco.com
> PO Box 367
> 22645 Canal Road
> Suite E
> Orange Beach, AL 36561
> tel: (251) 224-0868
> fax: (251) 224-0830
> mobile: (251) 747-4913
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