3Com Switch 7750 Configuration Guide

602 CHAPTER 57: DHCP SERVER CONFIGURATION
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■ There is no limit to the number of IP addresses statically bound in an interface
address pool, but the IP addresses statically bound in interface address pools
and the interface IP addresses must be in the same segment.
■ An IP address can be statically bound to only one MAC address. A MAC
address can be bound with only one IP address statically.
■ The IP address to be statically bound cannot be an interface IP address of the
DHCP server; otherwise the static binding does not take effect.
Configuring to assign IP addresses dynamically
As an interface-based address pool is created after the interface is assigned a valid
unicast IP address, the IP addresses contained in the address pool belong to the
network segment where the interface resides and are available to the interface
only. So specifying the range of the IP addresses to be dynamically assigned is
unnecessary.
To avoid IP address conflicts, the IP addresses to be dynamically assigned to DHCP
clients are those not occupied by specific network devices (such as gateways and
FTP servers).
The lease time can differ with address pools. But that of the IP addresses of the
same address pool is the same. Lease time is not inherited, that is to say, the lease
time of a child address pool is not affected by the configuration of the parent
address pool.
Enter interface view interface interface-type
interface-number
-
Configure static binding dhcp server static-bind
ip-address ip-address
mac-address mac-address
Required
By default, static binding is
not configured
Table 473 Configure to assign IP addresses by static binding
Operation Command Description
Table 474 Configure to assign IP addresses dynamically
Operation Command Description
Enter system view system-view -
Configure the
lease time
Configure for
the current
interface
interface interface-type
interface-number
Optional
The default lease time is one
day dhcp server expired { day
day [ hour hour [ minute
minute ]] | unlimited }
quit
Configure
multiple
interfaces in
system view
dhcp server expired { day
day [ hour hour [ minute
minute ]] |
unlimited }{interface
interface-type
interface-number [ to
interface-type
interface-number ] | all }