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List:       juniper-nsp
Subject:    Re: [j-nsp] Channelizing a 40GbE port
From:       Jonathan Call <lordsith49 () hotmail ! com>
Date:       2018-02-08 21:41:31
Message-ID: CY4PR19MB106486A762EC50E42885FD1AD1F30 () CY4PR19MB1064 ! namprd19 ! prod ! outlook ! com
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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@puck.nether.net> on behalf of Jonathan Call \
                <lordsith49@hotmail.com>
Sent: Thursday, February 8, 2018 2:28 PM
Cc: juniper-nsp@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@logn.net>
Sent: Thursday, February 8, 2018 1:29 PM
To: Jonathan Call
Cc: juniper-nsp@puck.nether.net
Subject: Re: [j-nsp] Channelizing a 40GbE port

On Feb 8, 2018, at 10:46 AM, Jonathan Call <lordsith49@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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