Re: [isp-bgp] BGP announcement question

[Marshall Eubanks <tme@multicasttech.com>]

You might then want to bifurcate your PI space - one block goes to  
one location, the
other to the other, with no over all short prefix / CIDR hole announced.

Regards
Marshall

On Feb 28, 2007, at 2:40 PM, Jim Barstow wrote:

> 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
> ------------------------------------
>
> -----Original Message-----
> From: Jeff Crowe [mailto:listacct@genhex.net]
> Sent: Wednesday, February 28, 2007 12:53 PM
> To: isp-bgp@isp-bgp.com
> Subject: RE: [isp-bgp] BGP announcement question
>
>
> You also want to make sure that you have a link going from site A  
> to site B.
> If your link at site B announcing the /23 goes down, all that  
> traffic will
> be directed to Site A with the /20 announcement.
>
> Jeff.
>
> > -----Original Message-----
> > From: James Jun [mailto:james@towardex.com]
> > Sent: February 28, 2007 1:52 PM
> > To: isp-bgp@isp-bgp.com
> > Subject: RE: [isp-bgp] BGP announcement question
> >
> > Route lookup works by selecting the most specific route over lesser
> > specific.  Thus, a /23 you announce in Site B would take precedence
> > over the HQ /20 announcement.  Traffic bound to IP's outside of that
> > /23 would end up
> > going to your HQ where /20 is being announced.
> >
> > james
> >
> >
> > -----Original Message-----
> > From: Jim Barstow [mailto:jimb-clec@dssitech.com]
> > Sent: Wednesday, February 28, 2007 1:45 PM
> > To: isp-bgp@isp-bgp.com
> > Subject: [isp-bgp] BGP announcement question
> >
> >  I have been googling for the answer to this, but couldn't find it.
> >
> > I have ARIN PI space at my an ASN in my headquarters location. It
> > announces the /20.
> >
> > I now have a new location that is not on my attached network,  
> > thus, it
> > has its own upstream peers and whatnot.  Can I announce a smaller
> > /23 from my
> > /20 from the new location?  Will the remainder of the /20 continue to
> > go towards my existing ASN?
> >
> > I don't know if there is some "glue" that ties my /20 to my primary
> > sites ASN.
> >
> >
> > ------------------------------------
> > 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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