we have detected an STP issue

Behaviour:
IP's of customers and services flapping for some seconds and are not reachable during this time

Reason:
old misconfiguration

workaround implemented, task remains open until we have this issue finally resolved

we have detected packet loss inside some subnets in DCJ1 with this issue

the root cause of the issue has been isolated and shut down
packet loss is not longer present

after a few days of monitoring, we have detected, that the STP issue is still present at the following racks:

* 3/c-a-01

You can find your rackplace in control panel -> "server data"

additional workaround implemented, task remains open until we have this issue finally resolved

we are working to resolve this issue.
short outages for L2 may apply to services in datacenter Jena 1 during this change.

We are sorry for any inconvenience.

A major change has been done today withing timewindow 0500 and 0630.
We have removed an old configuration between Datacenter Jena 1 Blocks B and C.

as the next step to resolve this issue we will perform an software upgrade to the following switches:

* d.b.02.01 (Rack d.b.02)

This upgrade includes a switch reboot. Downtime of 5-10 min may apply.

Time Window for upgrade:
17.09.2016, 0500-0900 CEST

the upgrade has been extended to the following switches:

* d.b.03.01 (Rack d.b.03)

the switch upgrade has been finished

an additional workaround has been implemented to resolve this issue

we have remove the old config today and are going to implement the new L2 config.

Affected services:
* All services hosted in Datacenter Jena1 C + D

Impact for customers:
* around 15 Minutes packet loss

we are going to reconfigure the L2 config in DCJ1-B

Affected services:
* All services hosted in Datacenter Jena1 B

Impact for customers:
* around 15 Minutes packet loss (multiple times)

we have moved switch uplink connections for all switches at:

* DCJ1-CR -> DCJ1-CR
to
* DCJ1-CR -> DCJ1-B

issue already resolved. no further impact detected.