<font size=2 face="sans-serif">As you may be aware, the DFC DMZ is having
a scheduled network outage in order to upgrade their routers / switches
to ipv6. The portion of this upgrade for the DFC DMZ will occur from
~8-8:30 Mountain on Saturday (14 Jul 2012) so we're looking at at least
a 30 minute outage for our systems. Looking at Level3's configuration
of our setup for ehp1 and 4 and ehpcache-den, we have a 1 minute TTL for
our servers, so they should automatically (in that time frame) become unavailable.
At which time we will only be running on ehpcache-men for those 30
minutes. Once the network comes back up, the aliveness checking will
reacquire ehpcache-den. </font>
<br>
<br><font size=2 face="sans-serif">I'm debating on whether to manually
exclude the Denver systems from L3 or rely on the failover. We have
tested the failover and it does work properly.</font>
<br>
<br><font size=2 face="sans-serif">Along with ehpcache-den (caching for
ehp1 and ehp4), other servers affected are ghscweb.cr.usgs.gov (geohazards
and geomag.cr), pdl1.cr.usgs.gov, eids1.cr.usgs.gov, comcat.cr.usgs.gov,
ciimwebden, ciimwebden2, ciimwebmaster, (also covered by L3), igskcicggsgis,
and gldplone (neic.usgs.gov).</font>
<br>
<br><font size=2 face="sans-serif">If you have any questions, please let
me know. I will be in the office to ensure our systems come back
online as soon as possible.</font>
<br><font size=2 face="sans-serif">----------------<br>
Thank you,<br>
<br>
Chris Bidwell, RHCSA<br>
Red Hat Linux Administrator<br>
National Earthquake Information Center<br>
US Geological Survey<br>
email: cbidwell@usgs.gov<br>
work: 303-273-8642<br>
mobile: 303-435-6362<br>
</font>