nanog mailing list archives
Re: Cogent Layer 2
From: Brandon Martin <lists.nanog () monmotha net>
Date: Thu, 15 Oct 2020 19:27:35 -0400
On 10/15/20 6:15 PM, Robert Blayzor wrote:
On 10/14/20 1:56 PM, Shawn L via NANOG wrote:When I last spoke to them, it sounded like they were using a bunch of LAG groups based on ip address because they _really_ wanted to know how many ip addresses we had and what kind of traffic we would be expecting (eyeball networks, big data transport, etc).Not why IP addresses are even an issue on an a "Layer 2" service. But then again, this is Cogent we're talking about here.
Hashing on LAGs within their core. Even otherwise fairly braindead Ethernet switches often hash on L3 to try and get more entropy.
I hope they hash on L2 MAC, as well, but a pretty common scenario for an L2 interconnect only has one MAC on each end of the link, so that doesn't help much. They reeeeallly don't want all your traffic ending up on one side of a LAG.
-- Brandon Martin
Current thread:
- Cogent Layer 2 Mike Hammett (Oct 14)
- Re: Cogent Layer 2 David Hubbard (Oct 14)
- Re: Cogent Layer 2 Shawn L via NANOG (Oct 14)
- Re: Cogent Layer 2 Robert Blayzor (Oct 15)
- Re: Cogent Layer 2 Brandon Martin (Oct 15)
- Re: Cogent Layer 2 Shawn L via NANOG (Oct 14)
- Re: Cogent Layer 2 David Hubbard (Oct 14)
- Re: Cogent Layer 2 Dale W. Carder (Oct 14)
- Re: Cogent Layer 2 Ryan Hamel (Oct 14)
- Re: Cogent Layer 2 Rod Beck (Oct 14)
- Re: Cogent Layer 2 Ryan Hamel (Oct 14)
- Re: Cogent Layer 2 Rod Beck (Oct 14)
- Re: Cogent Layer 2 Ryan Hamel (Oct 14)
- Re: Cogent Layer 2 Rod Beck (Oct 14)
- Re: Cogent Layer 2 Radu-Adrian Feurdean (Oct 14)
- Re: Cogent Layer 2 Rod Beck (Oct 14)