nanog mailing list archives
Re: 10G switch drops traffic for a split second
From: TJ Trout <tj () pcguys us>
Date: Tue, 29 Nov 2016 13:53:23 -0800
I plan on disabling FC on everything tonight, I've done that before but I want to be sure. Anything that can be done about the 2 x 1G peers trunking to the 10G router transition that can be fixed? should I be rate limiting the vlan for the peers at 1G so the 10G router isn't trying to send more than 1G? On Tue, Nov 29, 2016 at 1:47 PM, Michael Loftis <mloftis () wgops com> wrote:
Yes it is absolutely possible to overrun the buffers. Any kind of backpressure (FC) from hosts, or 10G->1G transitions can easily cause it. Even if in a 10s window you're not over 1G if the 10G sender attempts to back to back too many frames in a row (Like say sendfile() API type calls) BOOM, dropping frames in the switch. On Tue, Nov 29, 2016 at 1:28 PM, TJ Trout <tj () pcguys us> wrote:Luke; All l2, no l3. only 4 vlans. 2 peers trunked to a router which trunksbackto 2 devices (microwave backhauls). Chuck; All ports are 10g except the 2 peers are 1g and trunk back to a 10g port for the router wan No TCN's Brian; I have tried a IBM G8124 and a Ubiquiti ES-16-XG both show same exactdropsacross all ports, makes me think it's a config issue. MTU, FC, something. Andrew; I have tried with FC disabled, but I will try that one more time. Mikael; Is it possible to over run the buffers of a 320gbps backplane switch with only 1.5gbps traffic? I think the switch is rated for 140m PPS and I'monlypushing 100k PPS
Current thread:
- 10G switch drops traffic for a split second TJ Trout (Nov 29)
- RE: 10G switch drops traffic for a split second Luke Guillory (Nov 29)
- Re: 10G switch drops traffic for a split second Chuck Anderson (Nov 29)
- Re: 10G switch drops traffic for a split second Mikael Abrahamsson (Nov 29)
- Re: 10G switch drops traffic for a split second TJ Trout (Nov 29)
- Re: 10G switch drops traffic for a split second Michael Loftis (Nov 29)
- Re: 10G switch drops traffic for a split second TJ Trout (Nov 29)
- Re: 10G switch drops traffic for a split second Peter Beckman (Nov 29)
- Re: 10G switch drops traffic for a split second Michael Loftis (Nov 29)
- RE: 10G switch drops traffic for a split second Luke Guillory (Nov 29)
- Re: 10G switch drops traffic for a split second TJ Trout (Nov 29)
- Re: 10G switch drops traffic for a split second Mikael Abrahamsson (Nov 30)
- Re: 10G switch drops traffic for a split second Lee (Nov 30)
- <Possible follow-ups>
- Re: 10G switch drops traffic for a split second John Kristoff (Nov 29)