Cabletron Systems SmartSwitch manual Secondary Subnets and Directly-Connected Clients

Chapter 5: DHCP Configuration Guide

6.Include ‘scope2’ in the superscope ‘super1’.

dhcp scope2 attach 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.

interface create ip clients address-mask 10.1.1.1/16 port et.1.1

2.Assign a secondary address 10.2.1.1 to the interface ‘clients’.

interface add ip clients address-mask 10.2.1.1/16

3.Define the network parameters for ‘scope1’ with the default gateway 10.1.1.1.

dhcp scope1 define parameters address-netmask 10.1.0.0/16 gateway

10.1.1.1dns-domain acme.com dns-server 10.1.44.55

4.Define the address pool for ‘scope1’.

dhcp scope1 define pool 10.1.1.10-10.1.1.20

5.Define the network parameters for ‘scope2’ with the default gateway 10.2.1.1.

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

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