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If they lit a new fiber on a port that had spanning tree turned on, all hell can break loose. Sounds like the switches became overloaded and reset. Best practice is to log in to a switch and configure the port before plugging any type of cross connect cable in. And yes I do believe one subnet per floor / per building. Local default router on each floor, cross-connected to the central switch / firewall.
Chris Bipes
Director of Information Services
CrossCheck, Inc.
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Mike Cunningham
Sent: Wednesday, March 07, 2018 2:17 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: RE: What would cause hundreds of interactive users all start dropping, from multiple LPARs
We had this happen some years ago and it was a spanning tree issue. No failing hardware. Spanning had been misconfigured. At the time we have subnets that spanned multiple buildings and since then they changed to only having one subnet in a building. Problem has never returned.
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