Customer Service Center

This article describes how to configure Spirent TestCenter DHCP server to work with a DUT that is the DHCP relay agent

• Spirent TestCenter
• DHCP server

• The attached document outlines the steps needed to configure Spirent TestCenter DHCP emulation to work with a DUT that is the DHCP relay agent. 
• Also attached is a Spirent TestCenter 3.70 configuration file used in the example.
• Also attached is a Spirent TestCenter DHCP Server configuration when it is not on the same subnet as the DHCP Relay Agent

Basic Steps

1. Go to Settings->DHCPv4 tab and check the "Use Gateway when sending DHCPv4 messages to Relay Agents" box.
2. Next go to Devices->DHCP Server and select "Edit Relay Agent Address Pools" and enter the relay agent IP address into the Router List column.

• The DHCP Servers do not have to be on the same subnet as the Relay Agent
  • simply configure the gateway address to be that of the Relay Agent
  • ARP will need to be performed from the DHCP Servers so that the DUT will have the MAC addresses in its Table
• Sample Relay Agent behavior
  • Reference topology diagram along with key fields found in STC, Wireshark, the DHCP RFC, and the Cisco (an old Cisco 7200 router) configuration.
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  • Messages from the Reference Topology as seen through pcaps
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