hi Matthew, Keeping the current internet full feed in view its around 300k routes and sup720-3BXL should support 1million routes (its cisco though :p). So even if you terminate the links on 2 different edges coming from the same AS it should work fine.
If you are trying "bgp bestpath as-path multipath-relax" kindly share the outcomes because in my opinion it is used to load share between different as-path. I have never tried it before. Regards, Aftab A. Siddiqui On Tue, Feb 9, 2010 at 12:59 AM, Matthew Melbourne <[email protected]>wrote: > Thanks for the pointers towards eBGP Multipath. Can I check that this still > works if two links are terminated on different edge routers (though with > iBGP between the edge routers). I assume this will use additional TCAM > resources (Sup720-3BXL) in maintaining two routes per prefix, which could > be > significant for a full BGP feed? > > Cheers, > > Matt > > -----Original Message----- > From: Erik Cuevas [mailto:[email protected]] > Sent: 05 February 2010 12:33 > To: Matthew Melbourne > Subject: RE: [c-nsp] Load-sharing with two links to the same ISP > > Did you check out BGP multipath? > > > http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431 > .shtml > > > or is the AS Path is different try... > > bgp bestpath as-path multipath-relax(its hidden) > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Matthew Melbourne > Sent: Friday, February 05, 2010 6:33 AM > To: [email protected] > Subject: [c-nsp] Load-sharing with two links to the same ISP > > Hi, > > What techniques are available to load-share traffic on two links (of > equal bandwidth) to the same ISP (same AS) given that BGP only enters > the best path into the RIB? We could announce our prefixes over both > links, but splitting the preferred path announcements over the two > links, either using MED or ISP communities, but this only really > addresses inbound traffic. More of an issue is trying to load-share > outbound traffic; we assume we'll learn the same set of prefixes over > both links from the same ISP - one technique may be to simple split > the IPv4 address space in half and local-pref accordingly to prefer > one link or the other depending on the destination IP prefix? > > Cheers, > > Matt > > -- > Matthew Melbourne > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.733 / Virus Database: 271.1.1/2669 - Release Date: 02/05/10 > 07:35:00 > > _______________________________________________ > 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/
