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Difference Between a Reload via IOS Command and Loss of Power

Discussion in 'General Cisco Certifications' started by NetEyeBall, Feb 25, 2007.

  1. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Basic troubleshooting on cisco devices is to always check the SHOW VERSION and SHOW LOG every time you go into a router or switch to see if it reloaded or any interesting errors in the log.

    Here is the difference between a reload by loss of power and a reload by IOS Command RELOAD.

    Loss of power:

    Router uptime is 3 minutes
    System returned to ROM by power-on
    System image file is "flash:c2600-ik9o3s3-mz.123-19.bin"

    Reload command:

    Router uptime is 0 minutes
    System returned to ROM by reload
    System image file is "flash:c2600-ik9o3s3-mz.123-19.bin"

    Again..very basic, but very useful.
     
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall
  2. Headache

    Headache Gigabyte Poster

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    Thanx NetEyeBall. That's useful to know.
     
    Certifications: CCNA
    WIP: CCNP
  3. Boycie
    Honorary Member

    Boycie Senior Beer Tester

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    yeah, thanks :thumbleft
     
    Certifications: MCSA 2003, MCDST, A+, N+, CTT+, MCT
  4. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    Another thing to check is the flash memory on the router. If a router has reloaded look in the flash for a crash file. For example:

    Godel#sh fla

    System flash directory:
    File Length Name/status
    1 15569532 c2600-ik9o3s3-mz.123-1.bin
    2 354140 crashinfo_20050806-113627
    3 327489 crashinfo_20050809-102119
    [16251356 bytes used, 1572 available, 16252928 total]
    16384K bytes of processor board System flash (Read/Write)

    This router crashed twice, reloading automatically, but no one noticed because it booted fairly quickly.

    Spice_Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE
  5. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Wow! Cool! IS that a date and time stamp on the crash file?
     
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall
  6. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    Yes, date and time. Actually, I'd better move those crashinfo files off the router, the flash is full:

    [16251356 bytes used, 1572 available, 16252928 total]
    16384K bytes of processor board System flash (Read/Write)


    Spice_Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE
  7. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Ok..I tried to recreate this to see the crash file. But it didn't write one to the flash. Is there anything that should be enabled?
     
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall
  8. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    Crashinfo files are written to your flash automatically. However, you need to crash the router create one :)

    They are typically caused by stack or data corruption. Whenever I see one I start the bug hunt on Cisco's bugtool, usually that will turn up something. Then on to TAC if needed.

    Spice_Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE
  9. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Thanks! Something else to look for!!!
     
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall

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