En el caso de cisco no es muy común ver caer los equipos, pero utilizando una suerte de "comando oculto" podemos ver la forma en que caen y se recuperan de los errores.
Este comando oculto se llama test crash y se puede utilizar de la siguiente forma:
Router#test crash
WARNING: Command selections marked with '(crash router)' will crash
router when issued. However a selection 'C' will need to
be issued IMMEDIATELY before these selections to enable them.
Type the number for the selected crash:
--------------------------------------
1 (crash router) Bus Error, due to invalid address access
2 (crash router) Bus Error, due to parity error in Main memory
3 (crash router) Bus Error, due to parity error in I/O memory
4 (crash router) Address Error, due to fetching code from odd address
5 (crash router) Jump to zero
6 (crash router) Software forced crash
7 (crash router) Illegal read of address zero
8 (crash router) Divide by zero
9 (crash router) Corrupt memory
C Enable crash router selection marked with (crash router)
R (crash router) User enter read bus error address
U (crash router) User enter write bus error address
W (crash router) Software watchdog timeout (*** Watch Dog Timeout ***)
w (crash router) Process watchdog timeout (SYS-2-WATCHDOG)
d Disable crashinfo collection
e Enable crashinfo collection
i Display contents of current crashinfo flash file
m Write crashinfo on crashinfo RAM
n Change crashinfo flash file name
q Exit crash menu
s Save crashinfo to current crashinfo flash file
c Close current crashinfo flash file
t Write crashinfo on console TTY
x Exit crash menu
? C
Type the number for the selected crash:
--------------------------------------
1 (crash router) Bus Error, due to invalid address access
2 (crash router) Bus Error, due to parity error in Main memory
3 (crash router) Bus Error, due to parity error in I/O memory
4 (crash router) Address Error, due to fetching code from odd address
5 (crash router) Jump to zero
6 (crash router) Software forced crash
7 (crash router) Illegal read of address zero
8 (crash router) Divide by zero
9 (crash router) Corrupt memory
C Enable crash router selection marked with (crash router)
R (crash router) User enter read bus error address
U (crash router) User enter write bus error address
W (crash router) Software watchdog timeout (*** Watch Dog Timeout ***)
w (crash router) Process watchdog timeout (SYS-2-WATCHDOG)
d Disable crashinfo collection
e Enable crashinfo collection
i Display contents of current crashinfo flash file
m Write crashinfo on crashinfo RAM
n Change crashinfo flash file name
q Exit crash menu
s Save crashinfo to current crashinfo flash file
c Close current crashinfo flash file
t Write crashinfo on console TTY
x Exit crash menu
? 6
Causing a software forced crash...
10:44:18 UTC Fri Feb 5 2010: Breakpoint exception, CPU signal 5, PC = 0x6078406C
--------------------------------------------------------------------
Possible software fault. Upon reccurence, please collect
crashinfo, "show tech" and contact Cisco Technical Support.
--------------------------------------------------------------------
-Traceback= 0x6078406C 0x60254650 0x61366294 0x6138C3B4 0x626264B8 0x6262649C
$0 : 00000000, AT : 654E0000, v0 : 00000049, v1 : 000000A7
a0 : 651A5158, a1 : 00000320, a2 : 63D143E8, a3 : 66ED5C38
t0 : 66ED5C38, t1 : 6590FE60, t2 : 927C0000, t3 : 00000000
t4 : 000008B7, t5 : 00000F3B, t6 : 00000000, t7 : 00000000
s0 : 64CA0000, s1 : 0000003C, s2 : 00000036, s3 : 653D0000
s4 : 66F08DB0, s5 : 64CA0000, s6 : 6597DAD8, s7 : 64CA0000
t8 : 6640BE78, t9 : 0000B798, k0 : BFC003E0, k1 : 0000FF00
gp : 65068FA8, sp : 66F08D98, s8 : 648E0000, ra : 60254650
EPC : 6078406C, ErrorEPC : 00000000, SREG : 3400FF03
MDLO : 00000000, MDHI : 00000000, BadVaddr : 00000000
CacheErr : 00000000, DErrAddr0 : 00000000, DErrAddr1 : 00000000
Cause 00000024 (Code 0x9): Breakpoint exception
File bootflash:crashinfo_20100205-104418 Device Error :Bad device info block
File disk0:crashinfo_20100205-104418 Device Error :Invalid DOS media or no media in slot
File disk1:crashinfo_20100205-104418 Device Error :No device available
File slot0:crashinfo_20100205-104418 Device Error :Bad device info block
File slot1:crashinfo_20100205-104418 Device Error :No such device
File bootflash:crashinfo_20100205-104418 Device Error :Bad device info block
File disk0:crashinfo_20100205-104418 Device Error :Invalid DOS media or no media in slot
File disk1:crashinfo_20100205-104418 Device Error :No device available
File slot0:crashinfo_20100205-104418 Device Error :Bad device info block
File slot1:crashinfo_20100205-104418 Device Error :No such device
File bootflash:crashinfo_20100205-104418 Device Error :Bad device info block
10:44:18 UTC Fri Feb 5 2010: Breakpoint exception, CPU signal 5, PC = 0x6078406C
--------------------------------------------------------------------
Possible software fault. Upon reccurence, please collect
crashinfo, "show tech" and contact Cisco Technical Support.
--------------------------------------------------------------------
-Traceback= 0x6078406C 0x60254650 0x61366294 0x6138C3B4 0x626264B8 0x6262649C
$0 : 00000000, AT : 654E0000, v0 : 00000049, v1 : 000000A7
a0 : 651A5158, a1 : 00000320, a2 : 63D143E8, a3 : 66ED5C38
t0 : 66ED5C38, t1 : 6590FE60, t2 : 927C0000, t3 : 00000000
t4 : 000008B7, t5 : 00000F3B, t6 : 00000000, t7 : 00000000
s0 : 64CA0000, s1 : 0000003C, s2 : 00000036, s3 : 653D0000
s4 : 66F08DB0, s5 : 64CA0000, s6 : 6597DAD8, s7 : 64CA0000
t8 : 6640BE78, t9 : 0000B798, k0 : BFC003E0, k1 : 0000FF00
gp : 65068FA8, sp : 66F08D98, s8 : 648E0000, ra : 60254650
EPC : 6078406C, ErrorEPC : 00000000, SREG : 3400FF03
MDLO : 00000000, MDHI : 00000000, BadVaddr : 00000000
CacheErr : 00000000, DErrAddr0 : 00000000, DErrAddr1 : 00000000
Cause 00000024 (Code 0x9): Breakpoint exception
-Traceback= 0x6078406C 0x60254650 0x61366294 0x6138C3B4 0x626264B8 0x6262649C
=== Flushing messages (10:44:18 UTC Fri Feb 5 2010) ===
Buffered messages:
*Feb 5 10:42:15.167: %LINEPROTO-5-UPDOWN: Line protocol on Interface VoIP-Null0, changed state to up
*Feb 5 10:42:15.171: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to down
*Feb 5 10:42:15.171: %LINEPROTO-5-UPDOWN: Line protocol on Interface IPv6-mpls, changed state to up
*Feb 5 10:42:16.171: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
*Feb 5 10:42:17.503: %SYS-5-RESTART: System restarted --
Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 12.4(11)T2, RELEASE SOFTWARE (fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 01-May-07 04:19 by prod_rel_teamDe más está decir que se debe usar en equipos que no estén en producción... después no me culpen si bajaron su red por usarlo en cualquier lado.
Salute!
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