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Cisco實踐中遇到的幾個硬件和軟件的BUG

2019-11-05 00:04:29
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  無論是硬件還是軟件,即使在設計、測試、制造、檢驗等過程中都執行了嚴格的質量控制規范,仍有可能會出現一些瑕疵。下面介紹的幾個硬件或軟件的BUG,是實踐中經常碰到的,給大家做個參考,以便在您碰到時能夠迅速地識別和處理。
  
  1.Cisco 7200路由器I/O控制模塊硬件Bug可能會引起系統啟動時報錯:
  
  Warning: monitor nvram area is corrupt ... using default values
  environment checksum in NVRAM failed
  C7200 platform with 262144 Kbytes of main memory
  
  路由器進Rommon模式。該問題據說出現的概率大約為10的負19次方,處理方法是返修I/O控制模塊。
  
  2.Cisco 7200、7500、GSR 平臺上的提示:
  
  *Nov 30 00:00:40.771: WARNING: Enviro Monitor Reference Voltage was ZERO !
  *Nov 30 00:00:41.771: WARNING: Enviro Monitor Reference Voltage was ZERO !
  *Nov 30 00:00:42.771: WARNING: Enviro Monitor Reference Voltage was ZERO !
  *Nov 30 00:00:43.771: WARNING: Enviro Monitor Reference Voltage was ZERO !
  *Nov 30 00:00:44.771: %ENVM-0-SHUT: Environmental Monitor initiated shutdown
  Buffered messages:
  System Bootstrap, Version 12.2(4r)B2, RELEASE SOFTWARE (fc2)
  TAC Support: http://www.cisco.com/tac
  Copyright (c) 2002 by cisco Systems, Inc.
  
  以上提示看似電源毛病,其實也是一個硬件的Bug。表現為啟動正常,啟動完畢后重復出現告警,然后自動掉電(兩個電源同時開著也這樣),只有手動開機。show env 結果為:
  
  Router#sh env
  All measured values are normal
  Router#sh env last
  I/O Cont Inlet   PReviously measured at 24C/75F
  I/O Cont Outlet  previously measured at 24C/75F
  NPE Inlet     previously measured at 25C/77F
  NPE Outlet     previously measured at 25C/77F
  +3.45 V      is unmeasured
  +5.15 V      is unmeasured
  +12.15 V      is unmeasured
  -11.95 V      is unmeasured
  last shutdown reason - critical voltage
  Router#sh env all
  Power Supplies:
  Power Supply 1 is unmeasured.
  Power Supply 2 is unmeasured.
  
  Temperature readings:
  I/O Cont Inlet  measured at 24C/75F
  I/O Cont Outlet measured at 25C/77F
  NPE Inlet    measured at 26C/78F
  NPE Outlet    measured at 26C/78F
  
  Voltage readings:
  +3.45 V    is unmeasured
  +5.15 V    is unmeasured
  +12.15 V   is unmeasured
  -11.95 V   is unmeasured
  
  Envm stats saved 0 time(s) since reload
  
  處理辦法:返修I/O Controller
  
  3.Cisco Catalyst 6500 SUP720的引擎,IOS 12.2.14軟件版本,假如做NAT,當NAT轉換條目達到約6000條以上時,就會出現如下提示:
  
  *Mar 2 01:19:56.738: %SYS-3-CPUHOG: Task ran for 2048 msec (39/2), process = ip NAT Ager, PC = 4021C300.
  -Traceback= 4021C308 40EFB5CC 40EFBA64 40EFBF44
  *Mar 2 01:20:06.974: %SYS-3-CPUHOG: Task ran for 2172 msec (44/2), process = IP NAT Ager, PC = 4021C300.
  -Traceback= 4021C308 40EFB5CC 40EFBA64 40EFBF44
  
  系統隔一段時間就會重啟一次,在BootFlash中記錄Crash信息。 這個時候show proce cpu看到ip nat進程占CPU相當大:
  
  ------------------ show process cpu ------------------
  
  
  CPU utilization for five seconds: 44%/8%; one minute: 43%; five minutes: 44%
  PID Runtime(ms)  Invoked   uSecs  5Sec  1Min  5Min TTY Process
  
  72     200   6178     32 0.00% 0.00% 0.00%  0 Spanning Tree
  73      0     2     0 0.00% 0.00% 0.00%  0 Const MPLS RP pr
  74   1465884  7504888    195 3.18% 3.25% 3.65%  0 IP Input
  75    2480   6141    403 0.00% 0.00% 0.00%  0 CDP Protocol
  76      0     1     0 0.00% 0.00% 0.00%  0 PPPATM session d
  77      0     2     0 0.00% 0.00% 0.00%  0 PASVC create VA
  78   7856368  4520305    1738 28.58% 30.23% 30.71%  0 IP NAT Ager
  79     32    393     81 0.00% 0.00% 0.00%  0 HWIF QoS Process
  
  后來查到是軟件的Bug,還是思科內部的Bug,用CCO帳號也看不到。
后來升級到12.2.17就好了,同樣數量的NAT條目,IP NAT Ager進程只占0.16%。

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