Brocade Mobility RFS Controller CLI Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 940)

Brocade Mobility RFS Controller CLI Reference Guide 929
53-1003098-01
Chapter
13
DHCP-SERVER-POLICY
This chapter summarizes Dynamic Host Control Protocol (DHCP) server policy commands in the CLI
command structure.
DHCP automatically assigns network IP addresses to requesting clients to enable them access to
network resources. DHCP tracks IP address assignments, their lease times and their availability.
Each subnet can be configured with its own address pool. Whenever a DHCP client requests an IP
address, the DHCP server assigns an IP address from that subnet’s address pool. When the
controller's (wireless controller, service platform, or access point) onboard DHCP server allocates
an address to a DHCP client, the client is assigned a lease, which expires after a pre-determined
interval. Before a lease expires, wireless clients (with assigned leases) are expected to renew them
to continue using the addresses. Once the lease expires, the client is no longer permitted to use
the leased IP address. The controller's DHCP server policy ensures all IP addresses are unique, and
no IP address is assigned to a second client while the first client's assignment is valid (its lease has
not expired). IP address management is conducted by a controller’s DHCP server and not by an
administrator.
The controller’s internal DHCP server groups wireless clients based on defined user-class options.
Clients with a defined set of user-class values are segregated by class. A DHCP server can
associate multiple classes to each pool. Each class in a pool is assigned an exclusive range of IP
addresses. DHCP clients are compared against classes. If the client matches one of the classes
assigned to the pool, it receives an IP address from the range assigned to the class. If the client
doesn't match any of the classes in the pool, it receives an IP address from a default pool range (if
defined). Multiple IP addresses for a single VLAN allow the configuration of multiple IP addresses,
each belonging to different subnets. Class configuration allows a DHCP client to obtain an address
from the first pool to which the class is assigned.
Use the (config) instance to configure DHCP server policy parameters. To navigate to the config
DHCP server policy instance, use the following commands:
(config)#dhcp-server-policy
rfs7000-37FABE(config)#dhcp-server-policy test
rfs7000-37FABE(config-dhcp-server-policy-test)#
rfs7000-37FABE(config-dhcp-policy-test)#?
DHCP policy Mode commands:
bootp BOOTP specific configuration
dhcp-class Configure DHCP class (for address allocation using DHCP
user-class options)
dhcp-pool Configure DHCP server address pool
no Negate a command or set its defaults
option Define DHCP server option
ping Specify ping parameters used by DHCP Server
clrscr Clears the display screen
commit Commit all changes made in this session
do Run commands from Exec mode
end End current mode and change to EXEC mode
exit End current mode and down to previous mode