what is a good value for the log buffer? C850 series

Discussion in 'Cisco' started by Steven, Jan 10, 2008.

  1. Steven

    Steven Guest

    Hi all!

    I recently upgraded my C857 memory from 64Mb to 128Mb.
    (The 850 series have a memory slot, where you can place in a PC133
    DIMM - just make sure it is a low profile dimm)

    I was inspired by this article: (I used a low profile dimm -- no need
    te cut the metal frame) At your own risk!

    I have a picture of the inside if someone is interested.

    It now boots up with:

    "System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 2006 by cisco Systems, Inc.

    C850 series (Board ID: 2-149) platform with 131072 Kbytes of main


    No, to actually do something usefull with the extra ram :)
    I want to increase the log buffer a bit.
    How much should I set it with 128Mb ram?
    I've set it to 20k for now

    My device is als configered as DNS forwarder (to my ISP's upstream DNS
    Can I set the DNS cache time out a bit higher?

    Greetings & tanks in advace
    Steven, Jan 10, 2008
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  2. Steven

    Merv Guest

    20K for logging buffer should suffice

    Post output of show memory summary
    Merv, Jan 10, 2008
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  3. Steven

    Steven Guest

    sh mem
    Head Total(b) Used(b) Free(b) Lowest(b)

    Processor 81D5CFA4 90845276 16345888 74499388 74499388

    I/O 7400000 12582912 3590636 8992276 8981344

    Steven, Jan 11, 2008
  4. Steven

    Merv Guest

    you have around 74 Megs of free memory
    Merv, Jan 11, 2008
  5. Steven

    Sam Wilson Guest

    But you probably don't want to dedicate 74MB to the log buffer. :)

    On our fairly busy 6500s we have the log buffer up at 128KB, which is
    sometimes useful but can also be a pain to scroll through to the end.

    Sam Wilson, Jan 11, 2008
  6. Steven

    Steven Guest

    Hi there!
    Thanks for the tip.
    Seems a good amound to me.
    The log fills up with 7-12K/day
    so 128K wil give me a +- week or more

    More then enough

    Steven, Jan 11, 2008
  7. Steven

    Merv Guest

    You can also set up a syslog server to retain all loggin info for a
    long period of time.

    I like the logging buffer so that I can quickly find recent messages
    while on a routr/switches that I am torublshooting

    CAT6K-WILDCAT#show logging | inc Jan 11
    Jan 11 10:57:51.684 EST: %SYS-5-CONFIG_I: Configured from console by

    CAT6K-WILDCAT#show logging | inc Jan 11 10:
    Jan 11 10:57:51.684 EST: %SYS-5-CONFIG_I: Configured from console by
    Merv, Jan 11, 2008
  8. Steven

    Steven Guest


    Thanks for the tip!
    Very usefull!

    Steven, Jan 11, 2008
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