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| Solution # |
K50442440 |
| Title |
A Cisco 2600 or 3600 series router boots to ROMmon mode when a modem is attached to the console port |
| Core Issue |
This occurs when the router is reloaded, and is caused by echoing being enabled on the modem. |
| Resolution |
If a Cisco 2600 or 3600 series router goes into ROM Monitor (ROMmon) mode after a reload when a modem
is connected to the console port, perform the following steps:
- If possible, disconnect the modem from the console port and reload the router
to be sure the modem is causing the router to go into ROMmon mode.
- If the router boots normally without the modem connected, disable echoing
on the modem. Contact the modem manufacturer for procedures on disabling echo.
- After the echo feature is disabled, reconnect the modem to the router's console
port, and reload the router in order to test the workaround.
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| Problem Type |
Boot issues
Console, aux port and Telnet connectivity |
| Booting Problems |
Boots in ROMMON |
| When Problem Occurs |
After reboot or power cycle (and no other changes) |
| Platform Type |
Cisco 2600 Series
Cisco 3600 Series |
| Direct URL |
http://www.ciscotaccc.com/core/showcase?case=K50442440 |
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