Re: Strip AS in BGP peer
Sherwin Ang wrote: > well here it goes. we'll soon form a new internet exchange and i > would like to suggest a model in the route-server wherein the > route-server would strip out it's own AS and give the neighbors/peers > the AS's of the members. I have seen this in Any2IX but i have no > idea on how to implement it as if i am the Any2 route-server. Hi, Sherwin Sorry for the late reply. We (LONAP, London UK) have deployed our route-servers using BIRD and OpenBGPd on unix servers, rather than traditional big iron hardware for the following reasons : - Availability of the 'stripped asn' feature as you describe. - Multiple RIBs per BGP instance, so that route-server participants who filter (on the route-server) can do so without causing shadowing of prefixes. - Don't need the high-capacity forwarding - the route-servers swap prefixes, not traffic. As other posters in this thread have described, it's also possible to do this with the Quagga software, but the current codebase appears to creak (and then croak !) with scale, when multiple-ribs are enabled. This email is pretty brief; the exchange community have been discussing this and publishing talks on the subject since the beginning of the year, as our understanding of the problems of running the common open-source so I can point you to some resources that you may find interesting : Our decisions and introduction to the LONAP service : http://www.uknof.org.uk/uknof13/Davidson-LONAP_routeservers.pdf INEX (Dublin, IE) describe the per-peer RIB problem and Quagga problems : http://www.ripe.net/ripe/meetings/ripe-58/content/presentations/Hilliard-Why_use_Quagga_for_Route_Servers.pdf LINX (London, UK) also describe the per-peer RIB problem and explain their efforts to solve the Quagga problems : http://www.uknof.org.uk/uknof13/Hughes-IXP_routeservers.pdf EuroIX route server activity report from October : http://www.ripe.net/ripe/meetings/ripe-59/presentations/hiliard-euroix-update.pdf (Situation is more evolved now, but I don't know if more recent slides are public) The situation is likely to move quickly by the middle of next year, if there is interest it sounds like a good operational BOF for N'49. Andy
Re: Strip AS in BGP peer
On 28.10.2009 19:01 Cody Appleby wrote > More specifically: > - neighbor *ip or peer-group* attribute-unchanged as-path > To leave _everything_ unchanged (med and next hop which goes w/o saying ;-)) might even best. Hence go for neighbor attribute-unchanged Of course there are also other implemenations like OpenBGPD and BIRD (http://bird.network.cz/) which also do support that feature. You could even do per peer RIB to give each of your customer its own view. Does work for small to medium sized IXP but has not yet proven to run for really large IXP. Best regards, Arnold -- Arnold Nipper / nIPper consulting, Sandhausen, Germany email: arn...@nipper.de phone: +49 6224 9259 299 mobile: +49 172 2650958 fax: +49 6224 9259 333 signature.asc Description: OpenPGP digital signature
Re: Strip AS in BGP peer
More specifically: - neighbor *ip or peer-group* attribute-unchanged as-path Cheers, Cody On Wed, 28 Oct 2009 22:19:54 +0800, Adrian Chadd wrote: > Take a read of the quagga documentation. There's a BGP neighbor option > for stripping out the local AS when speaking eBGP. > > > > Adrian > > On Wed, Oct 28, 2009, Sherwin Ang wrote: >> Hello Nanog, >> >> am not sure if i should have placed this on the cisco-nsp or the >> juniper-nsp but someone may have a direct answer. >> >> well here it goes. we'll soon form a new internet exchange and i >> would like to suggest a model in the route-server wherein the >> route-server would strip out it's own AS and give the neighbors/peers >> the AS's of the members. I have seen this in Any2IX but i have no >> idea on how to implement it as if i am the Any2 route-server. >> >> if you could point me to the right direction or reading, i could take >> it from there.
Re: Strip AS in BGP peer
Take a read of the quagga documentation. There's a BGP neighbor option for stripping out the local AS when speaking eBGP. Adrian On Wed, Oct 28, 2009, Sherwin Ang wrote: > Hello Nanog, > > am not sure if i should have placed this on the cisco-nsp or the > juniper-nsp but someone may have a direct answer. > > well here it goes. we'll soon form a new internet exchange and i > would like to suggest a model in the route-server wherein the > route-server would strip out it's own AS and give the neighbors/peers > the AS's of the members. I have seen this in Any2IX but i have no > idea on how to implement it as if i am the Any2 route-server. > > if you could point me to the right direction or reading, i could take > it from there.
Strip AS in BGP peer
Hello Nanog, am not sure if i should have placed this on the cisco-nsp or the juniper-nsp but someone may have a direct answer. well here it goes. we'll soon form a new internet exchange and i would like to suggest a model in the route-server wherein the route-server would strip out it's own AS and give the neighbors/peers the AS's of the members. I have seen this in Any2IX but i have no idea on how to implement it as if i am the Any2 route-server. if you could point me to the right direction or reading, i could take it from there. -Sherwin
