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Need help Cat 6500 crash


Anyone know what this crash means?  This is a 6509 with a single Sup720

Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(33)SXI, RELEASE SOFTWARE (fc2)

System returned to ROM by s/w reset at 04:42:07 PST8PDT Mon Jan 2 2012 (SP by bus error at PC 0x40C6681C, address 0x424B)

---- Part of Supervisor crash log

Cache error detected!

  CPO_ECC     (reg 26/0): 0x0000000E

  CPO_CACHERI (reg 27/0): 0x00800000

  CP0_CAUSE   (reg 13/0): 0x00000800

Real cache error detected.  System will be halted.

Error: Primary instr cache, fields: ,

Actual physical addr 0x00000000,

virtual address is imprecise.

Imprecise Data Parity Error

Imprecise Data Parity Error

04:42:02 PST8PDT Mon Jan 2 2012: Interrupt exception, CPU signal 20, PC = 0x40C6681C

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Cisco Employee

Need help Cat 6500 crash

Hi Daniel,

what you saw is a CPU parity error, meaning that your Sup720 encountered a memory parity error and crashed (expected behaviour).

A parity error occurs when a bit value gets changed from its original value (0 or 1) to the opposite value. This occurs as either a soft parity error, or a hard parity error.  In the case of a soft parity error, the bit value is flipped in memory due to an influence external to the router at the current level. This type of problem is transient and will not repeat.  A hard parity error occurs when the bit value is changed by damage to the memory. In the case of a hard parity error the

problem will occur every time that region of memory is used, and you will see multiple events within a couple of days.  In the case of any type of a parity error, the best course of action is to monitor on the first occurrence and replace on the second.

For more info on parity errors please check:

Interesting to note that cause n.1 of parity errors is cosmic rays!!! So by no mean this is a clear indication of hw failure. Statistically soft errors happen much more frequently than hard errors.



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