nanog mailing list archives
RE: Thousands of hosts on a gigabit LAN, maybe not
From: Sameer Khosla <skhosla () neutraldata com>
Date: Fri, 8 May 2015 19:55:25 +0000
You may want to look at CLOS / leaf/spine architecture. This design tends to be optimized for east-west traffic, scales easily as bandwidth needs grow, and keeps thing simple, l2/l3 boundry on the ToR switch, L3 ECMP from leaf to spine. Not a lot of complexity and scale fairly high on both leafs and spines. Sk. -----Original Message----- From: NANOG [mailto:nanog-bounces () nanog org] On Behalf Of John Levine Sent: Friday, May 08, 2015 2:53 PM To: nanog () nanog org Subject: Thousands of hosts on a gigabit LAN, maybe not Some people I know (yes really) are building a system that will have several thousand little computers in some racks. Each of the computers runs Linux and has a gigabit ethernet interface. It occurs to me that it is unlikely that I can buy an ethernet switch with thousands of ports, and even if I could, would I want a Linux system to have 10,000 entries or more in its ARP table. Most of the traffic will be from one node to another, with considerably less to the outside. Physical distance shouldn't be a problem since everything's in the same room, maybe the same rack. What's the rule of thumb for number of hosts per switch, cascaded switches vs. routers, and whatever else one needs to design a dense network like this? TIA R's, John
Current thread:
- Re: Thousands of hosts on a gigabit LAN, maybe not, (continued)
- Re: Thousands of hosts on a gigabit LAN, maybe not Benson Schliesser (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Dave Taht (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not John Levine (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Rafael Possamai (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Brandon Martin (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Niels Bakker (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Brandon Martin (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Niels Bakker (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Miles Fidelman (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Miles Fidelman (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Blake Hudson (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not Sameer Khosla (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not Brian R (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not John R. Levine (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not charles (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not Phil Bedard (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not charles (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Baldur Norddahl (May 09)
- Re: Thousands of hosts on a gigabit LAN, maybe not charles (May 09)
- Re: Thousands of hosts on a gigabit LAN, maybe not John Levine (May 09)
- RE: Thousands of hosts on a gigabit LAN, maybe not charles (May 08)