Automatic-Configuration Parameter Acquisition Process; Configuration File Acquisition Process - HP FlexFabric 7900 Series Configuration Manual

2. If the device has no management Ethernet interface in up state at Layer 2 but has one or more Layer
2 Ethernet interfaces in up state, the device selects the VLAN interface of the default VLAN.
3. If no Layer 2 Ethernet interface is in up state, the device sorts all Layer 3 Ethernet interfaces in up
state first by the dictionary order of the interface types and then in ascending order of interface
numbers, and selects the one with the smallest interface number among the interfaces of the first
interface type.
Figure 38 Interface selection process
Management Ethernet interface
up at Layer 2?
Layer 2 Ethernet interface
Select one Layer 3 Ethernet
interface in up state

Automatic-configuration parameter acquisition process

After the device finds an interface for automatic configuration, it enables the DHCP client on the interface.
Then, the DHCP client broadcasts a DHCP request to locate a DHCP server and request configuration
settings. The DHCP request uses DHCP Option 55 to indicate the configuration settings the device
requires, including the configuration file name, the TFTP server domain name, the TFTP server IP address,
and the DNS server IP address.
After receiving a DHCP reply, the device resolves the packet for the assigned IP address. If the reply
provides an IP address, the device continues to examine the following options or fields in the DHCP reply:
Option 67 or the file field—Carries the configuration file name or URL. The device resolves Option
•
67 first. If Option 67 does not contain the configuration file name or URL, the device resolves the file
field. The configuration file name might indicate a file on an HTTP server or a TFTP server.
Option 150—Carries the TFTP server IP address. If this option contains a valid TFTP server IP
•
address, the device starts the configuration file acquisition process. Otherwise, the device resolves
Option 66.
• Option 66—Carries the TFTP server domain name. If Option 150 does not contain a TFTP server IP
address, the device resolves this option for a TFTP server domain name and tries to communicate
with the DNS server indicated by Option 6 to obtain the TFTP server IP address.
Option 6—Carries the DNS server IP address.
•
For more information about DHCP, see Layer 3—IP Services Configuration Guide.

Configuration file acquisition process

The device requests a configuration file from an HTTP server or a TFTP server:
N
in up state?
N
Y
Use the management
Ethernet interface
Y
Use the VLAN interface of
the default VLAN
133