Disagree that it’s a line in the sand. It’s use the right tool for the job.
If a device is low FIB, it’s that way for a reason. There are plenty of ways to massage that with policy and software, depending on capabilities , but at the end of the day, trying to sort 10 pounds of shit to store in a 5 pound bag is eventually going to end up the same way. On Tue, Jan 3, 2023 at 13:18 Mike Hammett <na...@ics-il.net> wrote: > There are likely more networks with 10 gigabit or less total external > capacity than there are with more. > > Creating imaginary lines in the sand doesn't really help anyone. > > > > > ----- > 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: *"Mel Beckman" <m...@beckman.org> > *To: *"Mike Hammett" <na...@ics-il.net> > *Cc: *"NANOG" <nanog@nanog.org> > *Sent: *Tuesday, January 3, 2023 10:57:34 AM > *Subject: *Re: SDN Internet Router (sir) > > It’s not a problem, due to cheap, plentiful high-speed memory and rapid > prefix search silicon in backbone routers. The entire Internet routing > table consumes at most a few gigabytes when fully structured (and only a > few hundred Mbytes stored flat). That’s less memory than your average > laptop sports. > > > Even in the worst case scenario, where every network decides to announce > only its most specific prefixes, the BGP backbone would temporarily enter > an oscillating state that generates a large number of routing updates into > the inter-domain routing space. In this case, BGP route damping will > quickly suppress the crazies while the backbone stabilizes. > > > Small routers should not be taking full tables, since there is no point to > them being in the default free zone. For large routers, neither memory nor > CPU speed are an issue. High-speed routers operating in the default-free > zone have a critical path in the forwarding decision for each packet: it > needs to take less than the inter-packet arrival time for minimum-sized IP > packets. > > > This is easy to achieve with today’s hardware. A router line card with an > aggregate line rate across all of its point-to-point interfaces of 10Tbps > (readily available in today’s gear) can process packets with just a handful > of cycles in the FIB Ternary Content Addressable Memory (TCAM) using > ASIC-assisted lookups. TCAM is the most expensive component you’re paying > for in such a router. It’s not cheap, but backbone routers don’t need > to be cheap. They just need to not be memory-constrained. > > -mel via cell > > On Jan 3, 2023, at 7:47 AM, Mike Hammett <na...@ics-il.net> wrote: > > > https://github.com/dbarrosop/sir > > I came across this over the weekend. Given that the project was abandoned > six years ago, are there any other efforts with a similar goal (more > intelligently placing routes into FIBs of low-FIB capacity devices? > > > > ----- > 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> > > >
