3Com S7902E, Руководство по настройке

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2-16
To do… Use the command… Remarks
Display IP addresses excluded from
automatic allocation in the DHCP
address pool
display dhcp server forbidden-ip Available in any view
Display information about bindings
display dhcp server ip-in-use { all
| ip ip-address | pool [ pool-name ] }
Available in any view
Display information about DHCP
server statistics
display dhcp server statistics Available in any view
Display tree organization
information of address pool(s) display dhcp server tree { all |
pool [ pool-name ] }
Available in any view
Clear information about IP address
conflicts reset dhcp server conflict { all | ip
ip-address }
Available in user view
Clear information about dynamic
bindings reset dhcp server ip-in-use { all |
ip ip-address | pool [ pool-name ] }
Available in user view
Clear information about DHCP
server statistics
reset dhcp server statistics
Available in user view
Using the save command does not save DHCP server lease information. Therefore, when the system
boots up or the reset dhcp server ip-in-use command is executed, no lease information will be
available in the configuration file. In this case, the server will deny the request for lease extension from
a client and the client needs to request an IP address again.
DHCP Server Configuration Examples
DHCP networking involves two types:
z
The DHCP server and client are on the same subnet and exchange messages directly.
z
The DHCP server and client are not on the same subnet and they communicate with each other via
a DHCP relay agent.
The DHCP server configuration for the two types is the same.
Static IP Address Assignment Configuration Example
Network requirements
As shown in Figure 2-1 , Switch B (DHCP client) and Switch C (BOOTP client) obtain the static IP
address, DNS server address, and gateway address from Switch A (DHCP server).
The client ID of VLAN-interface 2 on Switch B is
3030-3066-2e65-3234-392e-3830-3530-2d56-6c61-6e2d-696e-7465-7266-6163-6532. The MAC
address of VLAN-interface 2 on Switch C is 000f-e249-8050.