Understanding Low-Memory Warnings In Configuration Sessions - Cisco CRS-1 - Carrier Routing System Router Getting Started Manual

Chapter 9 Troubleshooting the Cisco IOS XR Software

Understanding Low-Memory Warnings in Configuration Sessions

The Cisco IOS XR software monitors memory usage in the Cisco CRS-1 router. If system memory
becomes low, an error message is displayed when you attempt to enter configuration mode.
An "out-of-memory" error message is displayed during one of the following situations:
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Never ignore a low-memory warning. These warnings indicate a memory state that could affect system
Caution
operations if not addressed.
"WARNING! MEMORY IS IN MINOR STATE"
If the system memory begins to run low, the following minor memory warning is displayed when you
enter a new configuration mode.
Though users are allowed to enter configuration mode, they should immediately reduce memory usage
using the tools described in the
on page
Failure to take action can result in a worsening situation and eventual impact to router operations.
"ERROR! MEMORY IS IN SEVERE (or CRITICAL) STATE"
When the memory is in a severe or critical state, router operation and performance is likely to be
affected. Regular users are not allowed to enter configuration mode. Only lr-root owners can enter
configuration mode to free memory by removing configurations.
In some situations, the commit command is not allowed. Users with lr-root access can still use the
commit force command to apply configurations that reduce memory usage. Reducing memory usage
normally means removing configurations, but a user can also add configurations that reduce memory
usage. For example, configuring the shutdown command on an interface could cause numerous routes
to be purged from Border Gateway Protocol (BGP), the Routing Information Base (RIB), and
Forwarding Information Base (FIB) configurations.
Caution The commit force command should be used only to apply configurations that reduce memory usage.
Adding configurations that increase memory usage could result in serious loss of router operation.
When a user attempts to enter configuration mode.
During a configuration session when the memory shortage occurs.
When a user attempts to load a target configuration from a large file that results in a memory
shortage.
During a commit operation that results in the low-memory warning message. The commit operation
is denied and only lr-root users can perform commit operations to remove configurations.
WARNING! MEMORY IS IN MINOR STATE
9-17.
"Removing Configurations to Resolve Low-Memory Warnings" section
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Memory Warnings in Configuration Sessions
9-15