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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
Command Mode
DHCP Pool Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
The relay destination of the DHCP server can be specified in the DHCP relay pool. To do this, use the
ip dhcp pool command to enter the DHCP pool configuration mode and then use the relay source
command to specify the source subnet of the client requests. Use the relay destination command to
specify the relay destination server address. Multiple relay sources and multiple relay destinations can
be specified in a pool. If a packet matches anyone of the relay sources, the packet will be forwarded
to all of the relay destinations.
When receiving a DHCP request packet, if the subnet that the packet comes from matches the relay
source of a relay pool, the packet will be relayed based on this relay pool. To relay a packet based on
the relay pool, if the request packet is a relayed packet, the GIADDR of the packet is the source of the
request. If the request packet is not a relayed packet, the subnet of the received interface is the
source of the packet.
In a DHCP relay pool, administrators can further use the class command and the relay target
command to associate a list of relay target addresses with a DHCP class.
Example
This example shows how a DHCP relay pool "pool1" is created. In the relay pool, the subnet
172.19.10.0/255.255.255.0 is specified as the source subnet and 10.2.1.1 is specified as the relay
destination address.
Switch# configure terminal
Switch(config)# ip dhcp pool pool1
Switch(config-dhcp-pool)# relay source 172.19.10.0 255.255.255.0
Switch(config-dhcp-pool)# relay destination 10.2.1.1
Switch(config-dhcp-pool)#
17-20
relay source
This command is used to specify the source subnet of client packets. Use the no form of command to
remove the source subnet
relay source IP-ADDRESS SUBNET-MASK
no relay source IP-ADDRESS SUBNET-MASK
Parameters
IP-ADDRESS
SUBNET-MASK
Default
None.
Command Mode
DHCP Pool Configuration Mode.
Command Default Level
Level: 12.
Specifies the source subnet of client packets.
Specifies the network mask of the source subnet.
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