H3C Technologies H3C S12500-X Series Switches - Manual (Page 73)

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Step Command Remarks
2. Set the DSCP value for DHCP
packets sent by the DHCP
client.
dhcp dscp dscp-value
By default, the DSCP value in DHCP packets
sent by the DHCP client is 56.
Displaying and maintaining the DHCP client
Execute display command in any view.
Task Command
Display DHCP client information.
display dhcp client [ verbose ] [ interface interface-type
interface-number ]
DHCP client configuration example
Network requirements
As shown in Figure 24 , on a LAN, Switch B contacts the DHCP server through VLAN-interface 2 to obtain
an IP address, DNS server address, and static route information. The DHCP client IP address resides on
network 10.1.1.0/24. The DNS server address is 20.1.1.1. The next hop of the static route to network
20.1.1.0/24 is 10.1.1.2.
The DHCP server uses Option 121 to assign static route information to DHCP clients.
Figure 23 shows the
Option 121 format. The destination descriptor field contains the following parts: subnet mask length and
destination network address, both in hexadecimal notation. In this example, the destination descriptor is
18 14 01 01 (the subnet mask length is 24 and the network address is 20.1.1.0 in dotted decimal
notation). The next hop address is 0A 01 01 02 (10.1.1.2 in dotted decimal notation).
Figure 23 Option 121 format
Figure 24 Network diagram