Administration: File Management
Auto Configuration/Image Update via DHCP
Cisco 500 Series Stackable Managed Switch Administration Guide 62
4
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, if any, in the DHCP messages received. 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.
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