[j-nsp] Spanning tree RJ45 SFP on QFX5100

Nick Ryce nick at fluency.net.uk
Fri Oct 24 11:31:56 EDT 2014

Hi Richard,

Are you able to swap the RJ45¹s for SM 1G and see if the issue is still
present which could indicate a possible port fault?

Nick Ryce

On 20/10/2014 18:12, "Michael Loftis" <mloftis at wgops.com> wrote:

>On Mon, Oct 20, 2014 at 7:41 AM, Richard Hartmann
><richih.mailinglist at gmail.com> wrote:
>> Dear all,
>> we are not done debugging yet, but as of right now, we are having a
>> rather strange effect...
>> Our setup looks as follows:
>> QFX5100 = CStest
>> sw1 = 2960g
>> sw2 = 2960g
>> sw3 = EX3300
>> sw4 = 2960g
>> sw5 = 2960S
>> CStest <RJ45 1G> sw1
>> CStest <SM 1G> sw2
>> CStest <SM 10G> sw3
>> CStest <RJ45 1G> sw4
>> CStest <SM 1G> sw5
>> The effect we're seeing is that Spanning Tree works just fine over the
>> Single Mode links, but not across the RJ45 SFPs.
>> Weirdly enough, LLDP and the like are being transmitted just fine.
>> Yes, we tried all available JunOS releases, even a few beta images.
>> Yes, we also tried 14.1X53-D10.
>> I am kinda stumped as to how this is even possible. While we all hate
>> RF45 SFP for various reasons, this is totally new and unexpected.
>Might be interesting to know whose RJ45 SFP's?  If third party I'd
>personally really tend to suspect/blame the third party...might be a
>coding issue, might be the onboard hardware doing something silly.
>I'd try a different vendor SFP.  It might be something Juniper is
>making worse and is still willing to fix even if it's not necessarily
>their problem - like there've been various i2c reading issues they've
>dramatically improved behavior for.
>> Yes, we're still having fun,
>> Richard
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>"Genius might be described as a supreme capacity for getting its
>into trouble of all kinds."
>-- Samuel Butler
>juniper-nsp mailing list juniper-nsp at puck.nether.net

More information about the juniper-nsp mailing list