Cisco Sg2008 Manual

							Administration
File Management
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For HTTP backups, you are prompted to browse to a location to save the file. A 
progress bar indicates the status of the file transfer.
Delete Configuration
The Delete Configuration page enables you to delete the Startup configuration or 
the Backup configuration. If you delete both the startup and the backup 
configuration files, when the switch reboots it will use the default configuration file.
To delete the Startup or Backup Configuration file:
STEP 1Click Administration > File Management > Delete Configuration in the navigation 
window. 
STEP  2Select the Startup Configuration or Backup Configuration file type.
STEP  3Click Apply.
Copying and Saving Configuration Files
The Copy/Save Configuration page enables you to copy files within the file 
system. For example, you can copy the Backup Configuration file to the Startup 
Configuration file so that it will be used the next time you boot up the switch.
To copy a file to the Startup or Backup Configuration file:
STEP 1Click Administration > File Management > Copy/Save Configuration in the 
navigation window. 
STEP  2Select the Source File Name: 
						

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•Running Configuration—Current configuration, including any changes 
applied in the current management session.
•Startup Configuration—Configuration file type used when the switch last 
booted. This does not include any configuration changes applied but not yet 
saved to the switch.
•Backup Configuration—Backup configuration file type saved on the switch.
•Mirror Configuration—If the Running Configuration is not modified for at 
least 24 hours, it is automatically saved to the Mirror Configuration file type, 
and a log message with severity level Alert is generated to indicate that a 
new Mirror Configuration file is available. The Mirror Configuration file can be 
used when the switch has problems booting with the Startup or Backup 
Configuration file types. In such cases, the administrator can copy the Mirror 
Configuration to either the Startup or Backup Configuration file type and 
reboot .
STEP  3For the Destination File Name, select the file type to be overwritten with the file 
you are copying:
•Startup Configuration—Configuration file type used when the switch last 
booted. This does not include any configuration changes applied but not yet 
saved to the switch.
•Backup Configuration—Backup configuration file type saved on the switch.
STEP  4Click Apply to begin the copy process.
When complete, a window displays the message, Copy Operation Successful.
DHCP Auto Configuration
The switch supports Auto Configuration through DHCP to facilitate configuration 
deployment and upgrades. This feature enables the configuration of a switch 
automatically when no configuration file is found in device storage during the boot 
process or when a newer configuration file is available for download.
NOTEThe Auto Configuration feature depends upon the proper configuration of other 
devices in the network, including a DHCP or BOOTP server, a TFTP server, and if 
necessary, a DNS server. 
						

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Overview
During startup, the switch attempts communication with a DCHP server to obtain 
its IP address and other information. If Auto Configuration is enabled, the switch 
may also download a startup configuration file, depending on the TFTP server and 
startup configuration file name it receives from the DHCP server. Auto 
Configuration is enabled by default. 
DHCP Auto Configuration initiates when the switch is rebooted with Auto 
Configuration enabled, and any of the following conditions occur:
1. Information on the TFTP server and Startup Configuration is received from the 
DHCP server, and Auto Configuration has not previously downloaded the 
configuration file. 
2. Information on the TFTP server and Startup Configuration is received from the 
DHCP server, and the configuration file name differs from the file name 
advertised in a previous DHCP message.
3. The Startup Configuration file is not present and no information on the TFTP 
server or Startup Configuration is received from the DHCP server.
When conditions 1 and 2 occur, the switch saves the file to flash memory. Upon 
subsequent startups, it compares the stored file name to the name specified in 
option 66/67 in the current DHCP message. If they differ, the new file is 
downloaded and written to flash memory.
NOTEWhen the system boots up for the first time, the switch does not have a specific 
name for the configuration file received from the DHCP server, as it has not 
downloaded a Startup Configuration file yet. If these options are received in the 
DHCP message, then that file name is saved and the download process begins.
When option 3 occurs, the switch looks for the TFTP server and Startup 
Configuration file as described in Default Network Configuration File.
DHCP Server Message Details
Any of the following fields might be returned by a BOOTP or DHCP server and 
processed by the switch:
•The name of the configuration file (boot file or option 67) to be downloaded 
from the TFTP server. 
•The identification of the TFTP server from which to obtain the boot file. 
The TFTP server IP address can be deduced from the multiple sources in a 
DHCP reply.  The switch makes its selection based on the following criteria, 
from the highest priority to the lowest: 
						

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1.  T h e  sname field in a DHCP or BOOTP reply.
2.  The TFTP server name (option 66) field in a DHCP reply.
3.  The TFTP server address (option 150) field in a DHCP reply.
4.  The siaddr field of a DHCP or BOOTP reply.
If only the sname or option 66 values are returned to the switch, a DNS 
server is needed to resolve the IP address of the TFTP server. After an IP 
address is assigned to the switch, if a hostname is not already assigned, 
Auto Configuration sends a DNS request for the corresponding hostname. 
Alternate TFTP Server and File Name
On the DHCP Auto Configuration page, you can configure an alternate TFTP 
server and file name to be used when the server or file name provided by the 
DHCP server cannot be located. The following procedure is followed:
1. The switch sends unicast messages to the TFTP server identified through 
DHCP, if provided. 
2. If the DHCP information is not provided or the server or file name cannot be 
found, then the server uses the alternate information, if configured. 
3. If the alternate information is not configured or the server or file name cannot be 
found, the switch sends broadcast TFTP requests for the file name in the DHCP 
message, if given. Otherwise, the switch enters default network configuration 
mode process described in the Default Network Configuration File section. 
Configuration File Download Details
The switch first attempts to download a host-specific configuration file. If this is 
not possible, it downloads the configuration file .cfg if Default 
Network Configuration Mode is enabled.
Host-specific Configuration File
The switch attempts to download the host specific configuration file whose name 
is specified as the boot file name in the reply from a DHCP/BOOTP server, or is 
configured as the Backup Configuration File for DHCP Auto Configuration. The 
switch makes three unicast TFTP requests for the specified boot file. If the unicast 
attempts fail, or if a TFTP server address was not provided, the switch makes 
three broadcast requests to any available TFTP server for the specified boot file. 
When the switch gets the configuration file, the configuration is validated for 
errors. If the validation is successful, the switch copies the configuration to the 
Startup Configuration file type, stores the configuration file name in non-volatile 
memory, and reboots the unit. 
						

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NOTEThe switch requires the boot file name to have a .cfg extension.
Default Network Configuration File
If Default Network Configuration Mode is enabled, the switch downloads the 
configuration file .cfg when any one of the following conditions 
occurs:
•A host specific configuration file is not specified or configured.
•A host specific configuration file does not exist on the TFTP server.
•A failure occurs during the download. 
NOTEThe startup configuration file cannot be present on the switch. If the startup 
configuration file is present on the switch, this process is not initiated. 
To resolve the hostname in the configuration file, the switch first downloads 
fp-net.cfg from the TFTP server. The fp-net.cfg file is referred as the default 
network configuration file and contains one or more IP-address-to-host-name 
mappings. The switch determines the hostname from the mappings with its IP 
address. If there is no mapping, the switch uses reverse DNS lookup to discover 
the hostname. 
The following is a sample fp-net.cfg file. 
config
  ...
  ip host switch_to_setup 192.168.1.10
  ip host another_switch 192.168.1.11
  ... 
exit
When a hostname has been determined, the switch issues a TFTP request for a 
file named .cfg, where  is the first eight characters of 
the switch hostname.
The switch uses the IP address to do a DNS reverse name lookup. For example, if 
the switch IP address is 192.168.1.10, the hostname becomes switch_t.cfg (the 
first eight characters in the example above).
The default switch name is derived as switch+last 6 digits of hex address. The 
mapping file should have the hostnames such as ip host switchD99FA5 
192.168.1.10. Then, the hostname learned for the  is 
switchD9.cfg for the switch having the IP address 192.168.1.10.
If the switch is unable to map its IP address to a hostname, Auto Configuration 
sends TFTP requests for the default configuration file host.cfg. 
						

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When the switch gets the default configuration file,  the configuration is validated 
for errors. If the validation is successful, then the switch copies the configuration to 
the Startup Configuration file type and reboots. In this case, the default 
configuration file name is not stored in the non-volatile memory.
NOTEIf the switch is unable to get the valid configuration file, then the process described 
above is repeated every 20 minutes until the switch gets a valid configuration file. 
The administrator can create a Startup Configuration file by manually saving the 
Running Configuration. The administrator can also disable Auto Configuration if 
desired. 
The following table summarizes the configuration files that can be downloaded, 
and the order in which they are sought.
An operator can terminate Auto Configuration at any time prior to the downloading 
of the file. This should be done when the switch is disconnected from the network, 
or if the required configuration files have not been set up on TFTP servers.
When a configuration file is successfully downloaded and saved to the Startup 
Configuration file type, the switch logs a message with severity level Alert prior to 
rebooting.Order 
SoughtFile Name Description Final File 
Sought
1.cfg Host-specific configuration file, 
ending in a *.cfg file extension
1
Ye s
2fp-net.cfg Default network configuration file No
3.cfg Host-specific configuration file, 
associated with hostnameYe s
4host.cfg Default configuration file Yes
1. This file name might be learned through DHCP or manually configured, as described in 
Alternate TFTP Server and File Name. 
						

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Setting DHCP Auto Configuration
You can use the DHCP Auto Configuration page to enable and disable the feature, 
configure TFTP server and file name settings, and view status information. 
When DHCP Auto Configuration is enabled, it will be in the Waiting for boot 
options state, until it receives the notification from the DHCP client. The DHCP 
client triggers the Auto Install process when it receives the IP address from the 
DHCP server, after which the status changes to Processing DHCP/BOOTP 
options, checking preconditions.
The following messages might display:
•Waiting for boot options
•Processing DHCP/BOOTP options, checking preconditions
•Downloading tftp:///
•Applying downloaded configuration
•Waiting for restart timeout
•Saving the downloaded configuration
•Stopped
•AutoInstall is completed.
•AutoInstall process is terminated:File  
validation failed.
•AutoInstall process is terminated:Failed to save the 
downloaded configuration file to start-up 
configuration.
•AutoInstall process terminated:Startup config is created 
manually.
•AutoInstall process is terminated :Boot file matched 
with the last downloaded file.
•AutoInstall process is terminated:Failed to resolve the 
boot file name. 
						

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To configure DHCP Auto Configuration:
STEP 1Click Administration > File Management > DHCP Auto Configuration in the 
navigation window.
STEP 2 Enter the parameters:
•Auto Configuration Via DHCP—Select Enable to enable this feature on the 
switch.
•Default Network Config Mode—Select Enable to have the switch 
download a default configuration file named fp-net.cfg when no host-
specific file is found on the switch. See Default Network Configuration File 
for details .
•Alternate TFTP Server—Specify the IP address of a TFTP server to serve 
as a backup. An alternate TFTP ser ver is used when unicast requests to the 
TFTP server specified in option 66 fails three times. (The length of the string 
cannot exceed 96 characters.)
•Alternate Configuration File—Specify an alternate configuration file name 
to serve as a backup. If no startup configuration file identified in DHCP option 
67, or if the specified file cannot be found on the TFTP server, Auto 
Configuration looks for the alternate file name. (The length of the string 
cannot exceed 32 characters.)
•Last Auto Configuration File Name—The configuration file name used the 
last time the Auto Configuration process executed. If a different file name is 
identified through DHCP, the file download process will begin.
•Current Status—The status of the Auto Configuration process. Possible 
values are AutoInstall Complete or In Progress.
STEP  3Click Apply. Your changes are saved to the Running Configuration.  
						

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Firmware Recovery Over HTTP
The switch has a firmware recovery feature that enables the restoration of a valid 
image on the switch after a failed download. If the power goes down during an 
image download, the switch might not be able to boot. In this event, although the 
image is not usable, the boot loader file that loads the firmware image from Flash 
memor y to R AM should continue to be functional. An HTTP ser ver is embedded in 
the boot loader file, enabling the administrator to connect to the switch over a 
switch port and use a web browser to download and install a new firmware image.
The switch enters the HTTP firmware recovery mode when the switch is booted 
and the boot loader cannot find a valid image in flash memory. In this mode, the 
boot loader sets the switch internal network port to the following static IP address:
•IP Address: 192.168.1.254
•Network Mask: 255.255.255.0
•Default Gateway: 192.168.1.1
An HTTP server starts and listens for client connections on port 80.
NOTEFirmware recovery can also be performed using the command line interface. Refer 
to the Cisco Small Business SF200E Command Line Reference.
To use this feature to download a new firmware image:
STEP 1Directly connect a management PC to any switch port. 
STEP  2Configure the IP address and mask on the management PC to be in the same 
subnet as the switch.
NOTE: You can access the system across a network if the default gateway IP 
address is 192.168.1.1. 
STEP  3Open a web browser and enter the IP address of the switch in the address bar 
(192.168.1.254). 
						

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NOTE: The HTTP firmware recovery features supports the following browsers:
•Firefox 3.0 and later versions
•Internet Explorer 6 and later versions
A Firmware Recovery page displays. No authentication is required.
The web page displays the PIC VID (product ID and vendor ID), serial number, and 
MAC Address of the switch. 
STEP  4Select Browse and select a valid firmware image to download. 
A progress bar appears while the file is downloading. The following message 
appears upon a successful download:
100% Complete
File downloaded successfully. Please wait while the file is being written to 
flash. 
The file selected by administrator is downloaded to RAM and is validated for 
following conditions:
•The CRC of the file is good.
•The STK file is built for this platform.
•The STK file size is within the partition limits (4.5 MB is reserved for this file).
If these conditions are met, the file is written to Flash memory and the system is 
rebooted using the new firmware. 
If any of these checks fail, the image is not written to Flash memory and the 
recovery process is stopped. You can restart the recovery process with a correct 
image file.
If the transfer is aborted because the browser window is refreshed or closed, the 
session is cleared and the session times out immediately. If the transfer is aborted 
because the network is unreachable, the session times out after 45 seconds. After 
the session times out, you can begin the recovery process again.