From: joseph@sled.gsfc.nasa.gov
Date: Mon Sep 27 2004 - 11:04:02 GMT-3
Hi Rich,
Your name rings a bell. Did you go to Secondary School at Suhum Sec. Tech.?
Joseph.
At 06:55 PM 9/26/2004, Peasah, Richard Kwame wrote:
>Folks,
>
>Can I borrow your brains for a few minutes? My internet router, a Cisco
>7304, is dropping packets from the input queue and I'm having a tough
>time figuring out the cause. Over the past 2 weeks there've been
>instances where all of a sudden it will drop all packets for minutes and
>then resume forwarding. It's been hard nailing down the exact time this
>behavior occurs. By the time I'm alerted by the help desk, the incident
>is over and the router is back forwarding packets. However, I'm seeing
>lots of flushing going on with respect to the input queue for the
>interface connecting to our ISP. See three instance of "show int"
>output below:
>
>Last clearing of "show interface" counters 03:01:42
>Input queue: 0/75/216/4427 (size/max/drops/flushes); Total output drops:
>2901
>
>Last clearing of "show interface" counters 03:51:56
>Input queue: 1/75/238/6161 (size/max/drops/flushes); Total output drops:
>3280
>
>Last clearing of "show interface" counters 05:05:08
>Input queue: 1/75/269/8047 (size/max/drops/flushes); Total output drops:
>4443
>
>Since I don't have a baseline to compare with I really can't tell
>whether this is normal (the flushes and the drops) but it sure doesn't
>look normal to me. Anyone with experience with this stuff please shed
>some light on this, please. I've both cef and fast switching configured
>and I'm not seeing any cache misses so far. At this point, one thing
>jumping at me is the "bad hop count" in the "sh ip traffic" output. This
>counter keeps incrementing as can be see below:
>
>08:00 7242548
>
>10:00 7267491
>
>12:00 7314403
>
>15:00 7387856
>
>16:00 7402531
>
>17:00 7419743
>
>I've been scouring CCO for some pointers without success. Some technotes
>suggest I turn on "debug ip error" but I'm really reluctant (actually
>scared) to do that for fear of taking the whole damn thing down. This is
>our only internet node so until I get a nod for them "Big Kahunas" I
>ain't doing no debugging. Any ideas? And oh, I've been checking my
>buffers and so far no misses there.
>
>Richard Peasah, Ph.D., CCIE 13662
>Networking & Telecommunications Services
>University of Kansas
>rpeasah@ku.edu
>(785) 864-9354
>
>_______________________________________________________________________
>Subscription information may be found at:
>http://www.groupstudy.com/list/CCIELab.html
Joseph Anokye, CCIE #6624
Principal Network Engineer
Raytheon ITSS
NASA Mission Communications IPNOC
Goddard Space Flight Center, Code 291
Greenbelt, MD 20771
Voice: (301) 286-0188, Fax: (301) 286-0305
E-mail: joseph@sled.gsfc.nasa.gov
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