[126375] in North American Network Operators' Group
RE: POE switches and lightning
daemon@ATHENA.MIT.EDU (Mark Mayfield)
Thu May 13 14:26:31 2010
From: Mark Mayfield <mark.mayfield@metro-inet.us>
To: Caleb Tennis <caleb.tennis@gmail.com>, North American Network Operators
Group <nanog@nanog.org>
Date: Thu, 13 May 2010 13:26:10 -0500
In-Reply-To: <6DECDD46-48BC-46C2-9894-16A0FC4A14BB@gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
About a month ago, we had a lightning strike near our main campus. We lost=
one POE Cisco 3560 completely (apparently blown power supply), and in a se=
parate but nearby building, another 3560 lost the ability to deliver POE, b=
ut continued to operate as a switch. Both had to be replaced. Both were on=
wiring closet type UPS'es with surge suppression, and those were unaffecte=
d.
Mark
-----Original Message-----
From: Caleb Tennis [mailto:caleb.tennis@gmail.com]
Sent: Thursday, May 13, 2010 10:37 AM
To: North American Network Operators Group
Subject: POE switches and lightning
We had a lightning strike nearby yesterday that looks to have come inside o=
ur facility via a feeder circuit that goes outdoors underground to our faci=
lity's gate.
What's interesting is that various POE switches throughout the entire build=
ing seemed to be affected in that some of their ports they just shut down/o=
ff. Rebooting these switches brought everything back to life. It didn't i=
mpact anything non-POE, and even then, only impacted some devices. But it =
was spread across the whole building, across multiple switches.
I was just curious if anyone had seen anything similar to this before? Our=
incoming electrical power has surge suppression, and the power to the swit=
ches is all through double conversion UPS, so I'm not quite sure why any of=
them would have been impacted at all. I'm guessing that the strike had so=
me impact on the electrical ground, but I don't know what we can do to prev=
ent future strikes from causing the same issues. Thoughts?
Confidentiality Statement: The documents accompanying this transmission con=
tain confidential information that is legally privileged. This information=
is intended only for the use of the individuals or entities listed above. =
If you are not the intended recipient, you are hereby notified that any di=
sclosure, copying, distribution, or action taken in reliance on the content=
s of these documents is strictly prohibited. If you have received this inf=
ormation in error, please notify the sender immediately and arrange for the=
return or destruction of these documents.
