nanog mailing list archives
RE: Thousands of hosts on a gigabit LAN, maybe not
From: "Chuck Church" <chuckchurch () gmail com>
Date: Fri, 8 May 2015 15:18:32 -0400
Sounds interesting. I wouldn't do more than a /23 (assuming IPv4) per subnet. Join them all together with a fast L3 switch. I'm still trying to visualize what several thousand tiny computers in a single rack might look like. Other than a cabling nightmare. 1000 RJ-45 switch ports is a good chuck of a rack itself. Chuck -----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:
- Thousands of hosts on a gigabit LAN, maybe not John Levine (May 08)
- RE: Thousands of hosts on a gigabit LAN, maybe not Chuck Church (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Christopher Morrow (May 08)
- 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)
(Thread continues...)