[c-nsp] Trying to understand 7200 VXR memory ... need help please.

[Rodney Dunn]

On Wed, Jun 25, 2008 at 10:44:14AM +0800, Wilkinson, Alex wrote:
> Hi all,
> 
> We have a:
> 
>    Cisco 7204VXR (NPE200) processor (revision B) with 114688K/16384K bytes of memory.
> 
> We are loosing our EIGRP neighbour adjaceny due to exhausting our memory usage
> (i think): e.g.
> 
>    EIGRP: Retransmission retry limit exceeded
>    Jun 17 15:57:39 atm-router 11682: Jun 17 15:57:39: %DUAL-5-NBRCHANGE:
>    IP-EIGRP(0) 1: Neighbor xxx.xxx.xx.xx (ATM1/0.48) is down: retry limit exceeded


How did you come to that conclusion?

Retry limit exceeded is simply you sent an update, query, etc. and you didn't
get an ACK back. It's all about packet loss.

Below you have 2M of free memory and you used 28M after the image
decompressed. 2M is low but that most likely isn't causing your EIGRP neighbor
to flap.

Rodney


t> 
> It appears that our 7200-VXR does indeed have 128MB DRAM i.e.
> 
>    "System Bootstrap, Version 11.1(13)CA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
>     Copyright (c) 1997 by cisco Systems, Inc.
>     C7200 processor with 131072 Kbytes of main memory"
>                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
>            However, when I do a "show processes memory" I only see 32MB e.g
> 
>            Processor Pool Total:   30801656 Used:   28807740 Free:    1993916
>                  I/O Pool Total:   16777216 Used:    1563104 Free:   15214112
>                  PCI Pool Total:    4194304 Used:    1131968 Free:    3062336
> 
> 
> Questions: 1. Can someone please confirm to me whether I do actually have 128MB of
>               main memory from the aforementioned output ?
> 
>            2. Why does a "show processes memory" only show 32MB in the
>               "Processor Pool Total" ?
> 
>            3. Is main memory (DRAM) divided up into "Pools" ? And can i change
>               how this divided up ?
> 
>            4. What are the "best practice" commands to watch memory usage ?
> 
> Thanks!
> 
> --                                                                 --
> Alex Wilkinson                     Systems Support - HMAS Stirling WA
> (08) 955 33614            Defence Science and Technology Organisation
> alex.wilkinson at dsto.defence.gov.au    http://www.dsto.defence.gov.au/
> --                                                                 --
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