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Continuous boot loop due to insufficient memory

Core Issue

On Cisco 2600, 3600, and 3700 series routers, the size of I/O memory is by default dynamically allocated during the boot, based on the size of the Cisco IOS  Software image after decompression. The size of I/O memory is then checked against memory requirements for installed network modules. If the amount of I/O memory is insufficient for operation of installed network modules, the router will report a sequence of messages similar to this:

Not enough memory in the system for IO memory

IO memory available 4110105 required 5242880 _> 2600

SYSTEM INIT: INSUFFICIENT MEMORY TO BOOT THE IMAGE!

Not enough memory in the system to run this image

Required pmem/iomem: 39435385/524288

*** System received a Software forced crash ***

Resolution

To resolve this issue, refer to the procedure in the Identifying a Continuous/Boot Loop Due to a Wrong Iomem Size section of Hardware Troubleshooting for the Cisco 3600 Series Router.

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