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User Guide 568
Configuring DHCP Service DHCP Relay Configuration
VLAN ID Specify the VLAN in which the clients can get IP addresses from the DHCP server.
Server Address Enter the IP address of the DHCP server.
3.2 Using the CLI
3.2.1 Enabling DHCP Relay
Follow these steps to enable DHCP Relay and configure the corresponding parameters:
Step 1 configure
Enter Global Configuration Mode.
Step 2 service dhcp relay
Enable DHCP Relay.
Step 3 ip dhcp relay hops
hops
Specify the maximum hops (DHCP relay agent) that the DHCP packets can be relayed. If a
packet’s hop count is more than the value you set here, the packet will be dropped.
hops:
Specify the maximum hops for DHCP packets. Valid values are from the 1 to 16, and
the default value is 4.
Step 4 ip dhcp relay time
time
Specify the threshold for the DHCP relay time.
DHCP relay time is the time elapsed since the client began address acquisition or renewal
process. There is a field in DHCP packets which specially records this time, and the switch
will drop the packets if the value of this field is greater than the threshold. Value 0 means
the switch will not examine this field of the DHCP packets.
time:
Specify the threshold for the DHCP relay time. Valid values are from 1 to 65535.
By default, the value is 0, which means the switch will not examine this field of the DHCP
packets.
Step 5 show ip dhcp relay
Verify the configuration of DHCP Relay.
Step 6 end
Return to Privileged EXEC Mode.
Step 7 copy running-config startup-config
Save the settings in the configuration file.
The following example shows how to enable DHCP Relay, configure the relay hops as 5 and
configure the relay time as 10 seconds :
Switch#configure
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