[c-nsp] 7206VXR Rebooting (heat related)

[Steve Coleman]

I have a 7206VXR that is extremely sensitive to heat.  We had a hot day today (93 outside), and our primary A/C failed, so our server room got warm (85 'ish) before the A/C was fixed.  Anytime the ambient air gets above about 80, the 7206 starts to reboot itself every 5 to 10 minutes.  

It's definitely heat related.  It's happened before, and you can practically set your watch to it. As soon as the room cools back down, it runs normally again.  

According to Cisco, the 7206 can withstand environmental conditions up to 104 degrees.  When I did a "sh env" it reported everything as normal, even when it was continually rebooting itself.  A "sh env all" would show all the temperatures within an acceptable limit, despite it being warm in the room.  

I even removed the unit from the cabinet and placed a large fan blowing towards the fan inlets on the left side of the unit, but it didn't help.  Not until the ambient temperature in the room came back down to under 80 would it work reliably.  No other piece of equipment failed due to the heat.  Fortunately we have two other Cisco routers that were running fine.  

Why is this router so sensitive?  Any thoughts on this?  

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(17a), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Thu 19-Jun-03 12:41 by pwade
Image text-base: 0x60008940, data-base: 0x61302000

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105], DEVELOPMENT S
OFTWARE
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(21)S, EARLY DEPLOYMENT RELEA
SE SOFTWARE (fc1)

cisco3.slc uptime is 1 hour, 16 minutes
System returned to ROM by bus error at PC 0x60104C78, address 0x6134305E at 12:4
7:08 UTC Mon Jun 20 2005
System image file is "disk0:c7200-is-mz.122-17a.bin"

cisco 7206VXR (NPE300) processor (revision B) with 229376K/65536K bytes of memor
y.
Processor board ID 30468806
R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache
6 slot VXR midplane, Version 2.7

Last reset from power-on