Administration: File Management
DHCP Auto Configuration/Image Update
89 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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SSH Client Authentication
SCP is SSH based. By default, remote SSH server authentication is disabled, so that the device
accepts any remote SSH server out of the box. You can enable remote SSH server
authentication so that only servers found in the trusted server list can be used.
SSH client authentication parameters are required to access the SSH server by the client
(which is the device). The default SSH client authentication parameters are:
• SSH authentication method: by username/password
• SSH username: anonymous
• SSH password: anonymous
NOTE The SSH client authentication parameters can also be used when downloading a file manually
(meaning, a download that is not performed through the DHCP Auto Configuration/Image
Update feature).
Auto Configuration/Image Update Process
DHCP Auto Configuration uses the configuration server name/address and configuration file
name/path from the DHCP messages received (if any). In addition, DHCP Image Update uses
the indirect file name of the firmware, if any, in the messages. This information is specified as
DHCP options in the Offer message coming from the DHCPv4 servers and in the
Information Reply messages coming from DHCPv6 servers.
If this information is not found in the DHCP server messages, backup information that has
been configured in the DHCP Auto Configuration/Image Update page is used.
When the Auto Configuration/Image Update process is triggered (see Auto Configuration/
Image Update Trigger), the sequence of events described below occurs.
Auto Image Update Starts:
• The switch uses the indirect file name from option 125 (DHCPv4) and option 60
(DHCPv6) if any, from the DHCP message received.
• If the DHCP server did not send the indirect file name of the firmware image file, the
Backup Indirect Image File Name (from the DHCP Auto Configuration/Image Update
page) is used.
• The switch downloads the Indirect Image File and extracts from it the name of the
image file on the TFTP/SCP server.
• The switch compares the version of the TFTP server's image file with the version of
the switch active image.
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