Allied Telesis AT-S63 User Manual

Chapter 8: File System

102

Section II: Advanced Operations

The flash memory file system is a flat file system—directories are not 
supported. However, directories are supported on compact flash cards. In 
both types of storage, files are uniquely identified by a file name in the 
following format:

filename.ext

where:

ˆ

filename is a descriptive name for the file, and may be one to sixteen 
characters in length. Valid characters are lowercase letters (a–z), 
uppercase letters (A–Z), digits (0–9), and the following characters: ~ ’ 
@ # $ % ^ & ( ) _ - { }. Invalid characters are: ! * + = “| \ [ ] ; : ? / , < >.

ˆ

ext is a file name extension of three characters in length, preceded by 
a period (.). The extension is used by the switch to determine the file 
type.

The following is an example of a valid file name for a boot configuration 
file:

standardconfig.cfg

The following is an example of an invalid file name for a file stored in flash 
memory:

sys/head_o.cfg

The backslash character (/ ) is not a valid character for files stored in flash 
memory because subdirectories are not supported in the flash memory 
system.

The file system displays filenames and directories in DOS 28.3 format. 
Filenames and directories longer than 32 bytes are represented in DOS 
8.3 format.

Table 9. File Extensions and File Types

.cfg

Configuration file

.cer

Certificate file

.csr

Certificate enrollment request

.key

Public encryption key

.log

Event log