Edge-Core ECS4660-28F, Руководство по управлению, Страница: 1642 / 2020

C
HAPTER
48
| DHCP Commands
DHCP Server
– 1642 –
C
OMMAND
M
ODE
DHCP Pool Configuration
U
SAGE
G
UIDELINES
◆ When a client request is received, the switch first checks for a network
address pool matching the gateway where the request originated (i.e.,
if the request was forwarded by a relay server). If there is no gateway
in the client request (i.e., the request was not forwarded by a relay
server), the switch searches for a network pool matching the interface
through which the client request was received. It then searches for a
manually configured host address that falls within the matching
network pool. If no manually configured host address is found, it
assigns an address from the matching network address pool. However,
if no matching address pool is found the request is ignored.
◆ This command is valid for DHCP network address pools only. If the
mask is not specified, the class A, B, or C natural mask is used. Subnet
addresses are interpreted as class A, B or C, based on the first field in
the specified address. In other words, if a subnet address
nnn.xxx.xxx.xxx is entered, the first field (nnn) determines the class:
0 - 127 is class A, only uses the first field in the network address.
128 - 191 is class B, uses the first two fields in the network address.
192 - 223 is class C, uses the first three fields in the network address.
◆
The DHCP server assumes that all host addresses are available. You can
exclude subsets of the address space by using the ip dhcp
excluded-address command.
E
XAMPLE
Console(config-dhcp)#network 10.1.0.0 255.255.255.0
Console(config-dhcp)#
next-server
This command configures the next server in the boot process of a DHCP
client. Use the no form to remove the boot server list.
S
YNTAX
[ no ] next-server address
address - Specifies the IP address of the next server in the boot
process, which is typically a Trivial File Transfer Protocol (TFTP)
server.
D
EFAULT
S
ETTING
None
C
OMMAND
M
ODE
DHCP Pool Configuration