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Routers may go into ROM monitor ( ROMmon ) mode for any of these reasons:
- Boot failure.
- The setting of the virtual configuration register forces the router to stop in ROMmon mode during the boot.
- A break sequence is sent to the console. The console will normally ignore the break, except during the boot. However, the virtual configuration register of the router may be configured to allow a break sequence at all times.
For more information about the virtual configuration register, refer to: Configuration Register.
To resolve your issue, please refer to the ROMmon recovery procedure that applies to your platform:
Cisco AS5200 Series
Cisco AS5300, AS5350 and AS5400 Series
Cisco 800 Series Router
Cisco 1000 Series Router
Cisco 1600 Series Router
Cisco 1700 Series Router
Cisco 2500, 3000, AS5100 and uBR900 Series Routers
Cisco 2600 Series Router and the VG200
Cisco 3600 Series Router
Cisco 4000 Series Router
Cisco 4500 and 4700 Series Routers
Cisco 7000 ( RP ) Series
Cisco 7200, 7300, 7400, 7500, RSP7000, Catalyst 5500 RSM, uBR7100, uBR7200, uBR10000, and 12000 Series Routers
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