Network Router User Manual

SmartSwitch Router User Reference Manual 73
Chapter 7: DHCP Configuration Guide
6. Include ‘scope2’ in the superscope ‘super1’.
Since there are multiple pools of IP addresses, the pool associated with ‘scope1’ is used
first since ‘scope1’ is applied to the interface before ‘scope2’. Clients that are given an
address from ‘scope1’ will also be given parameters from ‘scope1,’ which includes the
default gateway 10.1.1.1 that resides on the 10.1.x.x subnet. When all the addresses for
‘scope1’ are assigned, the server will start giving out addresses from ‘scope2’ which will
include the default gateway parameter 10.2.1.1 on subnet 10.2.x.x.
Secondary Subnets and Directly-Connected Clients
A directly-connected client is a system that resides on the same physical network as the
DHCP server and does not have to go through a router or relay agent to communicate
with the server. If you configure the DHCP server on the SSR to service directly-connected
clients on a secondary subnet, you must configure the secondary subnet using the
interface add ip command. The interface add ip command configures a secondary
address for an interface that was previously created with the interface create ip
command.
The following example shows a simple configuration to support directly-connected
clients on a secondary subnet.
1. Create an interface ‘clients’ with the primary address 10.1.1.1.
2. Assign a secondary address 10.2.1.1 to the interface ‘clients’.
3. Define the network parameters for ‘scope1’ with the default gateway 10.1.1.1.
4. Define the address pool for ‘scope1’.
5. Define the network parameters for ‘scope2’ with the default gateway 10.2.1.1.
dhcp scope2 attach superscope super1
interface create ip clients address-mask 10.1.1.1/16 port et.1.1
interface add ip clients address-mask 10.2.1.1/16
dhcp scope1 define parameters address-netmask 10.1.0.0/16 gateway
10.1.1.1 dns-domain acme.com dns-server 10.1.44.55
dhcp scope1 define pool 10.1.1.10-10.1.1.20
dhcp scope2 define parameters address-netmask 10.2.0.0/16 gateway
10.2.1.1 dns-domain acme.com dns-server 10.1.77.88