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6. (Optional.) Configuring DHCP relay agent support for Option 82
7. (Optional.) Setting the DSCP value for DHCP packets se
nt by the DHCP relay agent
8. (Optional.) Specifying the DHCP relay agent address for the giaddr field
9. (Optional.) Specifying the source IP address fo
r relayed DHCP requests
Enabling DHCP
Restrictions and guidelines
You must enable DHCP to make other DHCP relay agent settings take effect.
Procedure
1. Enter system view.
system-view
2. Enable DHCP.
dhcp enable
By default, DHCP is disabled.
Enabling the DHCP relay agent on an interface
About enabling the DHCP relay agent on an interface
With the DHCP relay agent enabled, an interface forwards incoming DHCP requests to a DHCP
server.
An IP address pool that contains the IP address of the DHCP relay interface must be configured on
the DHCP server. Otherwise, the DHCP clients connected to the relay agent cannot obtain correct IP
addresses.
Procedure
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Enable the DHCP relay agent.
dhcp select relay
By default, when DHCP is enabled, an interface operates in the DHCP server mode.
Specifying DHCP servers
Specifying DHCP servers on a relay agent
About specifying DHCP servers on a relay agent
To improve availability, you can specify several DHCP servers on the DHCP relay agent. When the
interface receives request messages from clients, the relay agent forwards them to all DHCP
servers.
Restrictions and guidelines
The IP address of any specified DHCP server must not reside on the same subnet as the IP address
of the relay interface. Otherwise, the clients might fail to obtain IP addresses.
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