• Status Closed
  • Percent Complete
    100%
  • Task Type Incident
  • Category Datacenter → Jena1
Attached to Section: Network
Opened by Admin - 2016-10-02

FS#1945 - heavy router load c6ka / packet drops

We have detected an issue at gateway DCJ1-A.
Closed by Admin
Tuesday, 11 October 2016, 14:07 GMT
Reason for closing:  Finished
Admin
Sunday, 02 October 2016, 23:16 GMT
We have detected some packet drops with heavy router load at DCJ1-A.

Problem:
* customers have reported packet loss from time to time ~1% at the last HOP before server in DCJ1-A
** only DCJ1-A was affected
* no further impact was seen by customers and our network monitoring
* no exact perimeter of the root cause was possible
* first report of the issue was around 26.9.2016

Admin
Sunday, 02 October 2016, 23:21 GMT
We investigated further since around 27.9.2016. We found an issue with one PC-Interface (Portchannel) at Gateway Router "dsw-c6ka-j1a" dropping packets on uplink to core.

Root-Cause:
* There was a missing enhancement for better traffic flow not needed with other optical interfaces.

Solution:
* The missing enhancement has been implemented since around 01.10.2016, 1900h CEST.
Admin
Sunday, 02 October 2016, 23:23 GMT
Further steps:
* We will monitor the situation for a while. If no further drops occur, we will close the issue.
Admin
Tuesday, 11 October 2016, 14:06 GMT
no further impact / loss detected, closing the issue as resolved.

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