[j-nsp] Channelizing a 40GbE port

[Jonathan Call]

Slight correction:

There are three states for the fpc/pic/port channel-speed setting
<no value > - This auto negotiates (and very poorly at that)
10g - This forces the qfx to expect four 10G links. (i.e. xe-0/0/49:0, xe-0/0/49:1 etc.)
disable-auto-speed-detection - This forces the qfx to expect a 40G link.

Jonathan

________________________________
From: juniper-nsp <juniper-nsp-bounces at puck.nether.net> on behalf of Jonathan Call <lordsith49 at hotmail.com>
Sent: Thursday, February 8, 2018 2:28 PM
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Channelizing a 40GbE port

I thought that only controlled the overall speed of the port. But apparently it forces it to a breakout mode.  Cool. Thanks.


It seems a best practice is to disable auto-channelization and then force the 10g speed for any breakout?


Jonathan


________________________________
From: Jason Healy <jhealy at logn.net>
Sent: Thursday, February 8, 2018 1:29 PM
To: Jonathan Call
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Channelizing a 40GbE port

On Feb 8, 2018, at 10:46 AM, Jonathan Call <lordsith49 at hotmail.com> wrote:
>
> Juniper has instructions on how to disable auto-channelization on the QFX series, but there doesn't appear to be a way to force (or even encourage) channelization. I have a qfx5100-48t with a QSFP-40G-SR in port 48 and a MTP-4xLC breakout cable connected to a couple of servers. The qfx5100-48t just can't/won't figure out the fact that I want it to channelize.


This is ringing a bell... judging from the comment in my config, have you tried this:

chassis {
    fpc 0 {
        pic 0 {
            /* Must explicitly set speed for fan-out interfaces to be recognized */
            port 48 {
                channel-speed 10g;
            }
        }
    }
}


Jason
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