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DHCP Configuration Examples

92 Enterasys Xpedition User Reference Manual

7. Create a superscope ‘super1’ that includes ‘scope1’.

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

For clients on the secondary subnet, the default gateway is 10.2.1.1, which is also the

secondary address for the interface ‘clients’.

Interacting with Relay Agents

For clients that are not directly connected to the DHCP server, a relay agent (typically a

router) is needed to communicate between the client and the server. The relay agent is

usually only needed during the initial leasing of an IP address. Once the client obtains an

IP address and can connect to the network, the renewal of the lease is performed between

the client and server without the help of the relay agent.

The default gateway for the client must be capable of reaching the XP’s DHCP server. The

XP must also be capable of reaching the client’s network. The route must be configured

(with static routes, for example) or learned (with RIP or OSPF, for example) so that the

DHCP server can reach the client.

The following example shows a simple configuration to support clients across a relay

agent.

1. Create an interface ‘clients’ with the primary address 10.1.1.1.

2. Define a static route to the 10.5.x.x. subnet using the gateway 10.1.7.10 which tells the

DHCP server how to send packets to the client on the 10.5.x.x subnet.

3. Define the network parameters for ‘scope1’ with the default gateway 10.5.1.1 (the

relay agent for the client).

4. Define the address pool for ‘scope1’.

dhcp scope1 attach superscope super1

dhcp scope2 attach superscope super1

interface create ip clients address-mask 10.1.1.1/16 port et.3.3

ip add route 10.5.0.0/16 gateway 10.1.7.10

dhcp scope1 define parameters address-netmask 10.5.0.0/16 gateway 10.5.1.1 dns-domain

acme.com

dhcp scope1 define pool 10.5.1.10-10.5.1.20

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Cabletron Systems SSIM-R8-02 Spécifications Page 112