Dell PowerConnect B-FCXs Configuration Manual page 899

FIGURE 133
The IP address validation and lease negotiation step
1. At boot-up, the device automatically checks its configuration for an IP address.
2. If the device does not have a static IP address, it requests the lease of an address from the
PowerConnect B-Series FCX Configuration Guide
53-1002266-01
The DHCP Client-Based Auto-Configuration steps
IP Address Validation and Lease Negotiation
Legend: Typical process (may change depending on environment)
System boot/
feature enable
(start)
Static or
Has IP
Yes
dynamic
address?
address?
No Static
Requests new
IP address from
DHCP server
Server
Yes
responds?
(4 tries)
No
Static address
is kept
DHCP Client
process ends
DHCP server:
•
If the server responds, it leases an IP address to the device for the specified lease period.
•
If the server does not respond (after four tries) the DHCP Client process is ended.
Configuring IP parameters – Layer 3 Switches
Existing Device New Device
Asks server if
Dynamic
address is valid?
server responds?
(in pool and
not leased)
No
TFTP Configuration Download and Update
Reboot or
Continue lease
feature re-enable?
Continue until
renewal time
Server
Yes
responds?
(4 tries)
No
Continue until
lease expires
IP address
is released
Other Possible Events
DHCP
Yes
Is IP address
valid?
(4 tries)
No
Yes
TFTP info from
DHCP server?
No
Yes
Use TFTP server name Use DHCP server
or server IP address address as TFTP
provided by server
Request files
from TFTP
TFTP server
No
responds and
has requested
file?
Yes
Merge file
with running config
(server file takes
precedence to
resolve conflicts)
TFTP download
process ends
26
Dynamic IP
Yes
is re-leased
to system
No
server address
857