Announcing more specifics than the supernet grows the routing table. Large routing table bad.
Jared Sent: Friday, November 13, 2020 From: "Ken Hohhof" <af...@kwisp.com> To: "'AnimalFarm Microwave Users Group'" <af@af.afmug.com> Subject: Re: [AFMUG] Multiple carriers Maybe you need to elaborate. From: AF <af-boun...@af.afmug.com> On Behalf Of Mike Hammett Sent: Friday, November 13, 2020 8:03 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Multiple carriers Please, please only use prefix length as a traffic engineering effort as the very, very last measure. Those that do that make the Internet worse for everyone. ----- Mike Hammett Intelligent Computing Solutions[http://www.ics-il.com/] [https://www.facebook.com/ICSIL][https://plus.google.com/+IntelligentComputingSolutionsDeKalb][https://www.linkedin.com/company/intelligent-computing-solutions][https://twitter.com/ICSIL] Midwest Internet Exchange[http://www.midwest-ix.com/] [https://www.facebook.com/mdwestix][https://www.linkedin.com/company/midwest-internet-exchange][https://twitter.com/mdwestix] The Brothers WISP[http://www.thebrotherswisp.com/] [https://www.facebook.com/thebrotherswisp][https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg] ------------------------------------------------------------ From: "Steven Kenney" <st...@wavedirect.org[mailto:st...@wavedirect.org]> To: "af" <af@af.afmug.com[mailto:af@af.afmug.com]> Sent: Friday, November 13, 2020 Subject: Re: [AFMUG] Multiple carriers What he said prepending sucks.. use /24's if you can. Also yes time to look for some 10Gbps interfaces. No way around it! I went from 1G to several 10G interfaces now I'm pushing my carriers for 100G interfaces. Carriers like Cogeco are telling me that we are the topic of discussion on a daily basis because we are pushing them to upgrade their network faster than they planned. If they can't keep up you'll be force into getting creative and getting into fiber yourselves. It will only grow and is going faster and faster. Don't worry about starlink! 25Mbps in a house in rural areas will be not enough in 5 years. [https://www.wavedirect.net/] [https://www.facebook.com/ruralhighspeed] [https://www.instagram.com/wave.direct/] [https://www.linkedin.com/company/wavedirect-telecommunication/] [https://twitter.com/wavedirect1] [https://www.youtube.com/user/WaveDirect] STEVEN KENNEY DIRECTOR OF GLOBAL CONNECTIVITY & CONTINUITY A: 158 Erie St. N | Leamington ON E: st...@wavedirect.org[mailto:st...@wavedirect.org] | P: 519-737-9283 W: www.wavedirect.net[http://www.wavedirect.net] ------------------------------------------------------------ From: "Adam Moffett" <dmmoff...@gmail.com[mailto:dmmoff...@gmail.com]> To: "af" <af@af.afmug.com[mailto:af@af.afmug.com]> Sent: Thursday, November 12, 2020 8:38:24 PM Subject: Re: [AFMUG] Multiple carriers I like the curling analogy. No perfect load balancing across the Internet. You can advertise the supernet out of all carriers and also advertise individual /24's out of the preferred carrier. BGP will use the longer subnet mask first and fallback to the supernet. If you have a bunch of non-contiguous allocations then obviously that's not an option, but if you have something bigger than a /24 then you can do it. I also would note that if Connection "A" goes down, connection "B", "C", or "D" might need to carry all the load and you may not know which way it will come in. You can test and see what happens in a planned outage, and tweak your settings just so, but I don't think you can guarantee that topology upstream from you didn't change at some point between your testing and the eventual unplanned outage. If you need 4Gb, then you might just need two 4Gb pipes to have meaningful redundancy. Depends what you're willing to live with. There's a saying that "slow is better than down", but IMO the phone blows up either which way so best to avoid either "slow" or "down" conditions. I'll also note that every time I've ordered a 1gig circuit they gave me GigE optics. If you order anything bigger, even if it's 1.1Gig then it'll be a 10Gig interface by necessity. An upgrade then is just a phone call, whereas the upgrade from 1Gig is a scheduled outage to swap interface cards. On 11/12/2020 7:15 PM, Matt Hoppes wrote: > Right. Which is not ideal. > >> On Nov 12, 2020, at 7:11 PM, Ken Hohhof >> <af...@kwisp.com[mailto:af...@kwisp.com]> wrote: >> >> There are smarter people than me here on the topic of BGP, but I believe >> load balancing via prepends is an inexact science. It's like the guy with >> the broom in curling, you can influence but not dictate the outcome. >> >> You'd probably have better control advertising each subnet via just one of >> the upstream providers, but then you lose the advantage of redundant feeds. >> >> -----Original Message----- >> From: AF <af-boun...@af.afmug.com[mailto:af-boun...@af.afmug.com]> On Behalf >> Of Matt Hoppes >> Sent: Thursday, November 12, 2020 5:45 PM >> To: af@af.afmug.com[mailto:af@af.afmug.com] >> Subject: [AFMUG] Multiple carriers >> >> I have a situation where I can buy several 1 gigabit pipes from several top >> tier carriers relatively inexpensively. >> Or I can buy one fat pipe from one carrier. >> >> Say I need 4 gigabits of bandwidth and have four 1 gigabit pipes from 4 >> carriers running BGP, is there a best way to load balance these? Just AS >> pre-pend subsets on each carrier so certain subnets prefer one over another? >> Or is there a better way? >> -- >> AF mailing list >> AF@af.afmug.com[mailto:AF@af.afmug.com] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com[http://af.afmug.com/mailman/listinfo/af_af.afmug.com] >> >> >> >> -- >> AF mailing list >> AF@af.afmug.com[mailto:AF@af.afmug.com] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com[http://af.afmug.com/mailman/listinfo/af_af.afmug.com] -- AF mailing list AF@af.afmug.com[mailto:AF@af.afmug.com] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com[mailto:AF@af.afmug.com] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com[http://af.afmug.com/mailman/listinfo/af_af.afmug.com] -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
