Administration: File Management
DHCP Auto Configuration/Image Update
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
92
6
•
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 (f 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
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
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.
•
If the two versions are different, the new version is loaded into the non-
active image, a reboot is performed and the non-active image becomes the
active image.
•
When using the SCP protocol, a SYSLOG message is generated informing
that reboot is about to start.
