Hi all, Thanks for all the replies, I had a feeling that with a single /24 there would be very little I could do. I had a read through this doco, which described the scenario I'm talking about.http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#conf5
They also suggest the way to do it is with AS-path prepend, but in the example they use x2 /24 subnets. I will look into a /23 and try my luck. Cheers,Josh > From: steve.hous...@itps.co.uk > To: joshua.riesenwe...@outlook.com; cisco-nsp@puck.nether.net > Subject: Re: [c-nsp] Basic inbound BGP path preferencing query > Date: Tue, 27 Jan 2015 14:52:04 +0000 > > You could always use an as-path prepend, > > Announce yours routes with the same prefix from both connections > > route 1 would show as AS123 AS5089 AS-XX > route 2 would show as AS123 AS123 AS174 AS-XX > > This allows more traffic to come in via route 1, whilst still utilising > route 2, (you can also add multiple pre-prends if required). For example > AS174 will prefer customer routes so traffic from as174 to your as123 > should always come in that path. Any of AS174¹s peerings may prefer that > route if they don¹t also peer with AS5089 for example. > > This obviously only works per entire subnet rather than individual IP¹s > but it still allows you to utilise both links un-equally (if that¹s a > word? :). > > SteveH > > > -----Original Message----- > From: Joshua Riesenweber <joshua.riesenwe...@outlook.com> > Reply-To: "joshua.riesenwe...@outlook.com" <joshua.riesenwe...@outlook.com> > Date: Tuesday, 27 January 2015 01:28 > To: "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net> > Subject: [c-nsp] Basic inbound BGP path preferencing query > Resent-From: Steve Housego <steve.hous...@it-ps.com> > > >Hi all, > >I'm looking for a bit of insight from someone with more BGP experience > >than me. (I've tried searching around the 'net trying to find an elegant > >solution.) > >I have the common enterprise configuration of 2x WAN links multi-homed > >with 2x ISPs. I have a single /24 public IP allocation being advertised > >out both links, and are using MEDs to preference one link. > >I'd like to load balance across both links, unfortunately, one link is > >lower-bandwidth and has a smaller data quota from the ISP.One simple > >solution is upgrading to a /23. Then I can preference a unique /24 subnet > >over each link, and assign the large bandwidth-consuming devices to that > >particular subnet on my better WAN link. > >My only hesitation is that configuration potentially uses more IP > >addresses than I need. Does anyone have any tips on preferencing certain > >IP addresses inbound through one link if I am only advertising a single > >/24? > >If there's a better way of doing this your ideas are welcome. > > > >Cheers,Josh > >_______________________________________________ > >cisco-nsp mailing list cisco-nsp@puck.nether.net > >https://puck.nether.net/mailman/listinfo/cisco-nsp > >archive at http://puck.nether.net/pipermail/cisco-nsp/ > > [http://www.it-ps.com/wp-content/uploads/2013/12/itps-logo.png] > > "Helping Your ICT Budget Deliver to its Maximum Potential" > > Steve Housego > Principal Consultant > > IT Professional Services > Axwell House > Waterside Drive > Metrocentre East Business Park > Gateshead > Tyne & Wear NE11 9HU > > T. 0191 442 8300 > F. 0191 442 8301 > > steve.hous...@itps.co.uk<mailto:steve.hous...@itps.co.uk> > > > Check out our new website at www.it-ps.com <http://www.it-ps.com/> and see > how we can help your IT budget deliver more for less. > > [http://itpswebhost01.it-ps.com/customer_images/itps/twitter]<http://twitter.com/#!/itpsltd> > [http://itpswebhost01.it-ps.com/customer_images/itps/facebook] > <http://www.facebook.com/pages/ITPS/180607505381380> > [http://itpswebhost01.it-ps.com/customer_images/itps/linkedin] > <http://uk.linkedin.com/in/itpsltd> > > Company No. 3930001<tel:3930001> registered in England > VAT No. 734 1935 33<tel:734%201935%2033> > > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/