Nicolas Fevrier has a very detailed blog post on how Cisco handles the prefixes on their Broadcom Jericho based NCS 5500 gear. https://xrdocs.io/cloud-scale-networking/tutorials/2017-08-03-understanding-ncs5500-resources-s01e02/
I'm pretty sure the principle is more or less the same for the Jericho based platforms on Arista and Extreme. Best regards, Chris On 01.11.18 15:31, Saku Ytti wrote: > Hey, > > They all do in principle the same thing. There are memories for > longest path lookup and memories for exact lookup. I believe the trick > is to put specific prefix size, like /24 to exact lookup table, > relieving the LPM table stress greatly. Then in parallel ask both, and > take more specific result. > > There are variation to this, like having multiple separate exact match > tables, and populating each with different prefix size, and so forth. > > Juniper on PTX is doing something quite different, they are asking > on-chip bloom filter about hint on where to query, reducing query > count they need to do towards high latency off-chip memory. > > MX is doing yet something different, having JNPR proprietary memory > ASIC (no longer plain (RL)DRAM). > > ASR9k is still just TCAM (for all ezchip generations, unsure about > lightspeed). > On Thu, 1 Nov 2018 at 15:26, Colton Conor <colton.co...@gmail.com> wrote: >> >> I think Extreme is doing the same thing with their Extreme OptiScale™ that >> Arista is doing with their Arista FlexRoute™ and EOS NetDB™. They are both >> using Broadcom Jericho /Qurman with extenal TCAM, but still has a hardware >> limitiation on route table size. Then in software they filer right? >> >> Question is who has a better solution Arista or Extreme for this? >> >> Also, the question is can any whitebox vendors do the same thing, with the >> same Broadcom switch you can buy for around $9k new. >> >> Another question, could you even consider these with the Juniper MX204 >> coming in at $20k? >> >> >> >> On Thu, Nov 1, 2018 at 8:04 AM Kevin Burke <kbu...@burlingtontelecom.com> >> wrote: >>> >>> Thanks for everyone who responded on and off list. >>> >>> >>> >>> As a small company that is happy to still be in business the pricing is too >>> good to ignore. A “gently used” ASR-9006 is something like $45k for one >>> plus a shelf spare. A brand new SLX 9540 is something like $30k for one >>> plus a shelf spare. >>> >>> >>> >>> There were some common things. Software is behind where we would like. >>> The occasional bug like that SSH one. Also there are some relatively >>> common features like IPv6 outbound ACL and BGP MED that aren’t there. This >>> stuff isn't a showstopper but I will take this a sign of things to come. >>> >>> >>> >>> As for the notes about full tables. Different vendors seem to have used >>> different techniques to get past the hard FIB limit that we are all used >>> to. I had the same question when pawing through the spec sheets. So I >>> asked the sales rep: >>> >>> >>> >>> “We can support 1.5M routes….. >>> >>> >>> >>> These platforms support all of the requirements detailed above for Internet >>> routing. In particular, they support a table size of 1.5 million IP routes >>> today, ensuring headroom for the next 5-7 years. This scale is made >>> possible through our new technology called Extreme OptiScale™ for Internet >>> Routing that optimizes programmable hardware and software capabilities to >>> accelerate innovation and deliver investment protection. >>> >>> >>> >>> https://www.extremenetworks.com/extreme-networks-blog/internet-routing-in-the-enterprise/” >>> >>> >>> >>> >>> >>> Kevin Burke >>> >>> 802-540-0979 >>> >>> Burlington Telecom - City of Burlington >>> >>> 200 Church St, Burlington, VT 05401 >>> >>> -----Original Message----- >>> From: NANOG <nanog-boun...@nanog.org> On Behalf Of Kevin Burke >>> Sent: Wednesday, October 31, 2018 4:02 PM >>> To: nanog@nanog.org >>> Subject: Brocade SLX Internet Edge >>> >>> >>> >>> Does anyone have any success with the Brocade SLX 9540 or similar? Its >>> going to be taking full BGP tables from two Tier1's and some peering. >>> >>> >>> >>> The specs and sales rep says its fine, but the price makes me think its too >>> good to be true. >>> >>> >>> >>> We are trying to shepherd an old Cat 6509 out of our core. >>> >>> >>> >>> >>> >>> Kevin Burke >>> >>> 802-540-0979 >>> >>> Burlington Telecom - City of Burlington >>> >>> 200 Church St, Burlington, VT 05401 > > >
