On Wed, Apr 27, 2016 at 4:41 PM, Peter Kranz <pkranz@unwiredltd.com> wrote:
Curious if you have any thoughts on the longevity of the 7500R and 7280R survival's with IPv4 full tables? How full are you seeing the TCAM getting today (I'm assuming they are doing some form of selective download)? And if we are currently adding 100k/routes a year, how much longer will it last?
I can't speak for Ryan or Netflix, but we (Arista) are stating our technique is good for 1M+ prefixes of IPv4+v6 combined. Internet right now is at between 575K and 635K IPv4 and between 28K and 35K IPv6 right now and its taken many many many years to get there, its foreseeable there's many years of growth there. Note that we don't do static partitioning between IPv4 and IPv6 and our how we do it has more headroom in it than we state, so we're confident. We're also not doing "selective download", this is every prefix in current table. What I can share is two different scenarios today: 1. a traditional internet edge router with multiple transit/peer providers, Internet as of right now, and a cloud customer that also has hundreds of thousands of prefixes internally Ryan's case might be different to others, but here are three scenarios deployed today: 1. a large hosting provider with full tables and many internal prefixes, 2. a cloud deployment. The former is at 854K IPv4 and 35K IPv6 of 'internet' as of a few weeks ago: 7500R# show ip route summary | grep Total Total Routes 575127 7500R# show ipv6 route summary | grep Total Total Routes 35511 7500R# show hardware capacity | grep Routing Forwarding Resources Usage Table Feature Chip Used Used Free Committed Best Case High Entries (%) Entries Entries Max Watermark Entries -------- ---------- --------- -------- ------ --------- ----------- ----------- --------- Routing Resource1 815 39% 1233 0 2048 817 Routing Resource2 469 45% 555 0 1024 471 Routing Resource3 14074 42% 18694 0 32768 14098 Routing V4Routes 696364 88% 89753 0 786432 697110 Routing V6Routes 0 0% 89753 0 786432 0 The latter is at 854K IPv4 + 45K IPv6: 7500R# show ip route summary | grep Total Total Routes 854393 7500R# show ipv6 route summary | grep Total Total Routes 45678 7500R# show hardware capacity | grep Routing Forwarding Resources Usage Table Feature Chip Used Used Free Committed Best Case High Entries (%) Entries Entries Max Watermark Entries -------- ---------- --------- -------- ------ --------- ----------- ----------- --------- Routing Resource1 1319 64% 729 0 2048 1320 Routing Resource2 809 79% 215 0 1024 814 Routing Resource3 24102 73% 8666 0 32768 24104 Routing V4Routes 644336 83% 124302 0 786432 644364 Routing V6Routes 17792 12% 124302 0 786432 17795 One could ask Geoff Huston where he thinks combined IPv4+v6 will exceed 1M entries but I would expect it to be many years away based on http://bgp.potaroo.net/ and we'd welcome discussions about if it you want to know our opinion [*] on how we're doing it will scale. What we're doing doesn't explode at 1M, there's headroom in it hence why we say "1M+". Again we're happy to talk about it, just ask your friendly arista person and if you don't know who to ask, ask me and i'll put you in touch with the right folks. cheers, lincoln. [*] ltd@arista.com