show region
CF-859
Cisco IOS Configuration Fundamentals Command Reference
July 2008
show region
To display valid memory regions (memory mapping) in use on your system, use the show region
command in Privileged EXEC mode.
show region [address hex-address]
Syntax Description
Defaults All memory regions are displayed.
Command Modes Privileged EXEC
Command History
Usage Guidelines This command can be useful for troubleshooting system bus errors. The system encounters a bus error
when the processor tries to access a memory location that either does not exist (a software error) or does
not respond properly (a hardware problem).
To use the show region command to troubleshoot a bus error, note the memory location address from
the show version command, the show context command, or from the system error message that alerted
you to the bus error. The show region command can then be used to determine if that address is a valid
memory location.
For example, in the output of the show version command after a system restart casued by a bus error,
you will see output similar to “System restarted by bus error at PC 0x30EE546, address 0xBB4C4.” In
this case, the memory location that the router tried to access is 0xBB4C4. If the address falls within one
of the ranges in the show region output, it means that the router was accessing a valid memory address,
but the hardware corresponding to that address is not responding properly. This indicates a hardware
problem.
address hex-address (Optional) If a hex address is specified, this command will search the region
list for the specified address.
Release Modification
12.1,
12.0(9)S
The show region command output was made available in the output of the show
technical-support command.
12.2(15)ZN,
12.2(15)BZ,
12.1(14)E,
12.2(13)S,
12.2(13),
12.2(13)T,
12.0(23)S
The show region command was enabled as a separate command.
12.2(25)S,
12.3(14)T
The show region command output was updated to display information about free
regions.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
