D-Link DGS-1520 Emulator - Page 248

network

Page 248 highlights

DGS-1520 Series Gigabit Ethernet Smart Managed Switch CLI Reference Guide 21-23 network This command is used to configure the network with its associated mask for a DHCP address pool. Use the no form of this command to remove the network. network {NETWORK-ADDRESS MASK | NETWORK-ADDRESS/PREFIX-LENGTH} no network Parameters NETWORK-ADDRESS MASK PREFIX-LENGTH Specifies the network address for the address pool. Specifies the bits that mask the network part of the address. Specifies the prefix length of the network. It is an alternative way to specify the network mask. Default None. Command Mode DHCP Pool Configuration Mode. Command Default Level Level: 12. Usage Guideline Use this command to configure a network for the address pool. The user cannot configure the manual binding entry in the address pool that was configured with the network. When the DHCP server receives a request from a client, the server will select an address pool or subnet in the address pool based on the following rules for address allocation. When an IP address is allocated to a host, a binding entry is created. • If the client is not directly connected to the DHCP server, the discover message is relayed by the relay agent. The server will select the address pool configured with a subnet that contains the GIADDR of the packet. If an address pool is selected, the server will try to allocate the address from the subnet. • If the client is directly connected to the server, the server will look for the subnet of the address pool that contains or match the primary subnet of the received interface. If not found, the server will look for the subnet of the address pool that contains or match the secondary subnet of the received interface. If an address is allocated from a specific subnet, the network mask associated with the subnet will be replied as the network mask to the user. The network configured for a DHCP address pool can be a natural network or a subnetwork. The configured DHCP address pools are organized as a tree. The root of the tree is the address pool that contains the natural network. The address pools that contain the sub-network are branches under the root, and the address pools that contain the manual binding entry is the leave under the branch or under the root. Based on the tree structure, the child address pool will inherit the attributes configured for its parent address pool. The only exception to this inheritance is lease attribute. Example This example shows how to configure the subnet 10.1.0.0/16 for the DHCP address pool pool1. Switch#configure terminal Switch(config)#ip dhcp pool pool1 Switch(config-dhcp-pool)#network 10.1.0.0/16 Switch(config-dhcp-pool)#default-router 10.1.1.1 Switch(config-dhcp-pool)# 244

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DGS-1520 Series Gigabit Ethernet Smart Managed Switch CLI Reference Guide
244
21-23 network
This command is used to configure the network with its associated mask for a DHCP address pool. Use the
no
form of this command to remove the network.
network {
NETWORK-ADDRESS MASK
|
NETWORK-ADDRESS
/
PREFIX-LENGTH
}
no network
Parameters
NETWORK-ADDRESS
Specifies the network address for the address pool.
MASK
Specifies the bits that mask the network part of the address.
PREFIX-LENGTH
Specifies the prefix length of the network. It is an alternative way to specify the
network mask.
Default
None.
Command Mode
DHCP Pool Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Use this command to configure a network for the address pool. The user cannot configure the manual binding
entry in the address pool that was configured with the network.
When the DHCP server receives a request from a client, the server will select an address pool or subnet in the
address pool based on the following rules for address allocation. When an IP address is allocated to a host, a
binding entry is created.
If the client is not directly connected to the DHCP server, the discover message is relayed by the relay
agent. The server will select the address pool configured with a subnet that contains the GIADDR of the
packet. If an address pool is selected, the server will try to allocate the address from the subnet.
If the client is directly connected to the server, the server will look for the subnet of the address pool that
contains or match the primary subnet of the received interface. If not found, the server will look for the
subnet of the address pool that contains or match the secondary subnet of the received interface.
If an address is allocated from a specific subnet, the network mask associated with the subnet will be replied as the
network mask to the user. The network configured for a DHCP address pool can be a natural network or a sub-
network. The configured DHCP address pools are organized as a tree. The root of the tree is the address pool that
contains the natural network. The address pools that contain the sub-network are branches under the root, and the
address pools that contain the manual binding entry is the leave under the branch or under the root. Based on the
tree structure, the child address pool will inherit the attributes configured for its parent address pool. The only
exception to this inheritance is lease attribute.
Example
This example shows how to configure the subnet 10.1.0.0/16 for the DHCP address pool pool1.
Switch#configure terminal
Switch(config)#ip dhcp pool pool1
Switch(config-dhcp-pool)#network 10.1.0.0/16
Switch(config-dhcp-pool)#default-router 10.1.1.1
Switch(config-dhcp-pool)#