Hi,
On 24/04/2018 3:16 PM, Sebastian Wiesinger wrote:
Hello,
we've noticed problems with third party vendors QSFP 40G optics after
upgrading our JunOS on QFX5100. The problems manifest as a general
instablility on the QSFP links with symptoms like:
* Links take minutes to come up
* Links go down randomly
* Links show CRC/Align errors and packets get dropped
Yes, I have 10 QFX5100-48S and I have been experiencing the same issues.
All 10 devices have third party QSFP+ optics/DAC's (fs.com coded for
Juniper). So far I have had similar issues to you but not in all cases:
* 4 of the QFX devices are on 16.1R3. These 4 devices each have 1 x
QSFP+-40G-LR4 and 2 x QSFP+-40G-CU3M. I have not had any issues at all
with these.
* 4 of the QFX devices are on 17.3R1.
- 2 devices with QSFP+-40G-LR4: These are what we have been mainly
experiencing issues with. Initially these had QSFP+40GE-IR4 optics and I
blamed the issues on the length of the fibre run being a problem (it was
quite close to the link budget). One of the links was flapping, and
currently we are having a problem where we see CRC/Align errors. The
optics are verified to be good testing in other equipment with the same
patch cables.
- 2 of the devices with QSFP+-40G-CU1M: No issues.
- 2 of the devices with QSFP+40GE-IR4: No issues.
- 2 of the devies with QSFP+-40G-CU5M: No issues.
* 2 of the QFX devices were on 17.3R1 but I have upgraded them to 18.1R1
yesterday. Before the upgrade I had some problems where certain traffic
wasn't working when it cross the virtual chassis (the virtual chassis
connection is over a pair of QSFP+-40G-CU5M links). Simply disabling the
virtual chassis port then enabling it again one by one fixed the
problem. The problem reoccured after a while so I elected to try
upgrading to 18.1R1 to see if it made any difference, that specific
problem has not occured since. I opened a JTAC case for the specific
problem with certain traffic not working and didn't get anywhere - I was
told to reboot the device which I said is not acceptable.
- Both devices have QSFP+-40G-CU5M (virtual chassis): This had the
issue noted above.
- Both devices have QSFP+-40G-LR4: These have the same issue with
traffic not working in some cases, or traffic will be super slow.
I can't keep switching firmware around to try and resolve this/isolate
to a specific revision, but it is interesting that you also note you
have not experienced any issues with 16.1, the same as us. If you get a
proper answer to what this issue is I would really like to know, but it
looks like I will probably have to downgrade to 16.1 due to these issues
as they are impacting services.
I have just ordered some EX4600's for a new office fitout along with
some 40G DAC's and 40G QSFP+ interfaces from fs.com as well. I am
curious to see if I have the same issues with those, I suspect that
would be a yes.
Thanks
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