nanog mailing list archives
Re: Thousands of hosts on a gigabit LAN, maybe not
From: Jima <nanog () jima us>
Date: Fri, 08 May 2015 18:19:04 -0600
On 2015-05-08 12:53, John Levine wrote:
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
I won't pretend to know best practices, but my inclination would be to connect the devices to 48-port L2 ToR switches with 2-4 SFP+ uplink ports (a number of vendors have options for this), with the 10gbit ports aggregated to a 10gbit core L2/L3 switch stack (ditto). I'm not sure I'd attempt this without 10gbit to the edge switches, due to Rafael's aforementioned point of the bottleneck/loss of multiple ports for trunking.
Not knowing the architectural constraints, I'd probably go with others' advice of limiting L2 zones to 200-500 hosts, which would probably amount to 4-10 edge switches per VLAN.
Dang. The more I think about this project, the more expensive it sounds. Jima
Current thread:
- RE: Thousands of hosts on a gigabit LAN, maybe not, (continued)
- 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)
- Re: Thousands of hosts on a gigabit LAN, maybe not Joe Hamelin (May 08)
- Re: Thousands of hosts on a gigabit LAN, maybe not Karl Auer (May 09)
- Re: Thousands of hosts on a gigabit LAN, maybe not Bruce Simpson (May 09)
- Re: Thousands of hosts on a gigabit LAN, maybe not Nick Hilliard (May 10)
- Re: Thousands of hosts on a gigabit LAN, maybe not Eduardo Schoedler (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 Eduardo Schoedler (May 09)
- RE: Thousands of hosts on a gigabit LAN, maybe not c b (May 10)