If you provide the prefixes in question it would be easier. You may want to have your customer check with their other upstreams to see what communities they support. BGP communities that adjust local preference are preferred over prepending. See http://www.onesc.net/communities/ for a listing for a number of providers.
-Matt On Jun 9, 2009, at 3:09 PM, Gino Villarini wrote: > Exactly, > > The problem is not for own ip space, its for a downstream customer ips > space, they have several providers and want to favor our link for > some > ip ranges. They are prepending such ranges to the other providers to > favor our link. > > > Gino A. Villarini > g...@aeronetpr.com > Aeronet Wireless Broadband Corp. > tel 787.273.4143 fax 787.273.4145 > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] > On > Behalf Of David > Sent: Tuesday, June 09, 2009 3:02 PM > To: 'WISPA General List' > Subject: Re: [WISPA] Need BGP Support ASAP > > You prepend the link you want to disfavor. The more you prepend the > longer a route will look. > > David > >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >> On Behalf Of Gino Villarini >> Sent: Tuesday, June 09, 2009 12:57 PM >> To: WISPA General List; can...@believewireless.net >> Subject: Re: [WISPA] Need BGP Support ASAP >> >> Should I not prepend to favor our link? >> >> >> Gino A. Villarini >> g...@aeronetpr.com >> Aeronet Wireless Broadband Corp. >> tel 787.273.4143 fax 787.273.4145 >> >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >> On Behalf Of Michael Baird >> Sent: Tuesday, June 09, 2009 2:52 PM >> To: can...@believewireless.net; WISPA General List >> Subject: Re: [WISPA] Need BGP Support ASAP >> >> You mean prepending AS numbers, not routes. Prepending will also >> lengthen the the calculation, so if they are prepending to you, this >> would the route through your link less favorable to the outside >> world. >> >> Are you seeing the prepend coming from their routers? On a cisco it >> would be show ip neighbor <ipaddress> received-routes, if you are >> seeing the prepend from them, check and see if you are forwarding >> them > >> on to your upstream show ip neighbor <ipaddress of upstream >> interface> > >> advertised-routes. If you see these in both places, it's most likely >> your upstream not allowing the prepend. >> >> Regards >> Michael Baird >>> Did you notify your upstream that you be advertising your customers >> routes? >>> >>> On Tue, Jun 9, 2009 at 2:24 PM, Jeff Broadwick<jeffl...@comcast.net> >> wrote: >>> >>>> I recommend Tony Mattke for dynamic routing work. >>>> >>>> t...@mattke.net >>>> >>>> Regards, >>>> >>>> Jeff >>>> >>>> -----Original Message----- >>>> From: wireless-boun...@wispa.org >>>> [mailto:wireless-boun...@wispa.org] >>>> On Behalf Of Gino Villarini >>>> Sent: Tuesday, June 09, 2009 2:22 PM >>>> To: WISPA General List >>>> Subject: [WISPA] Need BGP Support ASAP >>>> >>>> Anyone available for some BGP support? >>>> >>>> Im providing Internet service to another ISP, they are prepending >>>> some routes to favor our link, still my router doesnt acknoledge it >>>> >>>> >>>> Gino A. Villarini >>>> g...@aeronetpr.com >>>> Aeronet Wireless Broadband Corp. >>>> tel 787.273.4143 fax 787.273.4145 >>>> >>>> >>>> >>>> >>>> ------------------------------------------------------------------- >>>> - >> - >>>> ------- >>>> ---- >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> ------------------------------------------------------------------- >>>> - >> - >>>> ------- >>>> ---- >>>> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>>> >>>> >>>> ------------------------------------------------------------------- >>>> - >> - >>>> ----------- >>>> WISPA Wants You! 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