Hi, It would be something like:
Router A: router bgp 12345 network a1.a2.a3.a4 network b1.b2.b3.b4 neighbour x.x.x.x remote-as ABC neighbor x.x.x.x local-as 6789 [no-prepend] -> to this one the AS path of a1.a2.a3.a4 will be 6789 12345 or only 6789 (depending of no-prepend) neighbor y.y.y.y remote-as ABC -> to this neighbour you'll have AS path 12345 HTH Gustavo Novais -----Original Message----- From: Alex Haan [mailto:[EMAIL PROTECTED] Sent: terça-feira, 3 de Julho de 2007 22:07 To: Gustavo Novais; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [email protected] Subject: [SPAM] - RE: [c-nsp] Configure two AS on one BGP router - Dynamic IP detecte - Dynamic IP detected Yeap, this is exactly for migration purposes due to upcoming merge event. Both AS numbers are likely to stay for some time. Currently, each AS has two BGP routers running IBGP and they work fine. Let's say the origianal configurations are as follows: Router A: router bgp 12345 network a1.a2.a3.a4 neighbor x.x.x.x remote-as ABC Router B: router bgp 6789 network b1.b2.b3.b4 neighbor y.y.y.y remote-as ABC I am trying to configure 2nd AS on router A. Does the suggested configuration look like this? Router A: router bgp 12345 network a1.a2.a3.a4 network b1.b2.b3.b4 neighbor x.x.x.x locate-as 6789 [no-prepend] a1.a2.a3.a4 belongs to AS A and b1.b2.b3.b4 belongs to AS B. In this case, I either have to advertise networks from both AS through AS 6789 (I am not sure whether it works practically because ISPs sometimes filter the advertisement of the networks that do not belong to your AS) or suppress prefix a1.a2.a3.a4 as it belongs to AS 12345, am I right? One alternative might be getting another neighbor IP address from ISP ABC, but I am not sure if the idea works practically. There are some other interesting things behind this scenario, such as peer connections within/between AS A and B because one router will be in both ASes. Thanks, Alex >From: "Gustavo Novais" <[EMAIL PROTECTED]> >To: "Alex Haan" ><[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,<[EMAIL >PROTECTED]>,<[email protected]> >Subject: RE: [SPAM] - RE: [c-nsp] Configure two AS on one BGP router - >Dynamic IP detected dnsbl.sorbs.net >Date: Tue, 3 Jul 2007 20:40:14 +0100 > >You have the option to suppress your actual AS from the AS path >(no-prepend), or not. > >By default your AS path will look like {local-AS your AS}. >This will not suppress any routes, it is supposedly used for migration >purposes, (for example, two companies have merged and wish to keep their >peering agreements). > >To the peers of AS A, route X will appear as coming from A, and to the >peers of AS B, route X will appear as coming from B. >If you want to filter anything, use filter-list|prefix-list|route-map >etc... > >Gustavo Novais > > > > >-----Original Message----- >From: Alex Haan [mailto:[EMAIL PROTECTED] >Sent: terça-feira, 3 de Julho de 2007 19:59 >To: Gustavo Novais; [EMAIL PROTECTED]; [EMAIL PROTECTED]; >[email protected] >Subject: [SPAM] - RE: [c-nsp] Configure two AS on one BGP router - Dynamic >IP detected dnsbl.sorbs.net > >I guess that this enables advertisement of one AS's network while >suppressing the advertisement of the networks from the other AS, right? One >newb question, can I advertize the networks for both AS through one AS? > >Thanks, > >Alex > > >From: "Gustavo Novais" <[EMAIL PROTECTED]> > >To: "Paul Stewart" <[EMAIL PROTECTED]>,"Joseph Jackson" > ><[EMAIL PROTECTED]>,"Alex Haan" > ><[EMAIL PROTECTED]>,<[email protected]> > >Subject: RE: [c-nsp] Configure two AS on one BGP router > >Date: Tue, 3 Jul 2007 19:39:03 +0100 > > > >You can also look at neighbor X.X.X.X local-as, to impersonate other AS's > > > >Gustavo Novais > > > > > > > > > >-----Original Message----- > >From: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] On Behalf Of Paul Stewart > >Sent: terça-feira, 3 de Julho de 2007 18:45 > >To: 'Joseph Jackson'; 'Alex Haan'; [email protected] > >Subject: Re: [c-nsp] Configure two AS on one BGP router > > > >Never done it... > > > >But can you not create: > > > >router bgp 12345 > >network x.x.x.x > >etc... > > > >router bgp 98765 > >network x.x.x.x > > > >into the same router?? > > > >Paul > > > > > >-----Original Message----- > >From: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] On Behalf Of Joseph Jackson > >Sent: Tuesday, July 03, 2007 1:39 PM > >To: Alex Haan; [email protected] > >Subject: Re: [c-nsp] Configure two AS on one BGP router > > > >You could do it inside a VRF, but I don't know if it would work for what > >you want since it makes seprate routing tables. > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] On Behalf Of Alex Haan > > > Sent: Tuesday, July 03, 2007 10:34 AM > > > To: [email protected] > > > Subject: [c-nsp] Configure two AS on one BGP router > > > > > > Hi Everyone, > > > > > > Is it possible to configure two ASes on one BGP router? If it's > > > possible, how many feeds we are going to receive from an ISP peer? One > > > or Two? > > > > > > Thanks, > > > > > > Alex > > > > > > _________________________________________________________________ > > > Tell us your tech love story in the Summer Lovin Competition for your > > > chance to win laptop loaded with Windows Vista, Office 2007 and > > > Windows Live OneCare. > > > http://www.microsoft.com/canada/home/contests/summerlovin/default.aspx > > > > > > _______________________________________________ > > > cisco-nsp mailing list [email protected] > > > https://puck.nether.net/mailman/listinfo/cisco-nsp > > > archive at http://puck.nether.net/pipermail/cisco-nsp/ > > > > >_______________________________________________ > >cisco-nsp mailing list [email protected] > >https://puck.nether.net/mailman/listinfo/cisco-nsp > >archive at http://puck.nether.net/pipermail/cisco-nsp/ > > > >_______________________________________________ > >cisco-nsp mailing list [email protected] > >https://puck.nether.net/mailman/listinfo/cisco-nsp > >archive at http://puck.nether.net/pipermail/cisco-nsp/ > >_________________________________________________________________ >Windows Live Hotmail. Even hotter than before. Get a better look now. >www.newhotmail.ca?icid=WLHMENCA148 > _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_pcmag_0507 _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
