Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual page 218

Chapter 9 Troubleshooting Memory
Troubleshooting Process Memory
the memory may fragment into very small blocks, to the point where all processes requiring a larger
block of memory cannot get the amount of memory that they need. This may affect router operation
to the extent that you cannot connect to the router and get a prompt if the memory is badly
fragmented.
If memory fragmentation is detected, shut down some interfaces. This may free the fragmented
blocks. If this works, the memory is behaving normally. (You should add more memory.) If shutting
down interfaces does not resolve the problem, contact Cisco Technical Support. For Cisco Technical
Support contact information, see the "Obtaining Documentation and Submitting a Service Request"
section on page viii in the Preface.
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
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