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PowerConnect B-Series FCX Configuration Guide 857
53-1002266-01
Configuring IP parameters – Layer 3 Switches
26
FIGURE 133 The DHCP Client-Based Auto-Configuration steps
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
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.
IP Address Validation and Lease Negotiation
Legend: Typical process (may change depending on environment)
Existing Device
New Device
Other Possible Events
Has IP
address?
Ye s
No
Ye s
No
Ye s
No
Ye s
Ye s
No
Ye s
No
No
Ye s
No
Ye s
No
System boot/
feature enable
(start)
Static
Static or
dynamic
address?
Dynamic
Requests new
IP address from
DHCP server
Server
responds?
(4 tries)
DHCP Client
process ends
Static address
is kept
Asks server if
address is valid?
(in pool and
not leased)
DHCP
server responds?
(4 tries)
Is IP address
valid?
Continue lease
Continue until
renewal time
Server
responds?
(4 tries)
Continue until
lease expires
IP address
is released
Dynamic IP
is re-leased
to system
TFTP Configuration Download and Update
TFTP info from
DHCP server?
Use TFTP server name
or server IP address
provided by server
Use DHCP server
address as TFTP
server address
Reboot or
feature re-enable?
Request files
from TFTP
Merge file
with running config
(server file takes
precedence to
resolve conflicts)
TFTP download
process ends
TFTP server
responds and
has requested
file?