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RUGGEDCOM ROS
User Guide
Setup and Configuration
This chapter describes how to setup and configure the device for use on a network using the various features
available in ROS. It describes the following tasks:
•
Section 5.1, "Configuring the DHCP Relay Agent"
•
Section 5.2, "Managing Virtual LANs"
•
Section 5.3, "Managing Spanning Tree Protocol"
•
Section 5.4, "Managing Classes of Service"
•
Section 5.5, "Managing MAC Addresses"
•
Section 5.6, "Managing Time Services"
•
Section 5.7, "Managing SNMP"
•
Section 5.8, "Managing Network Discovery"
•
Section 5.9, "Managing Multicast Filtering"
•
Section 5.10, "Managing Port Security"
•
Section 5.11, "Managing Link Aggregation"
Section 5.1
Configuring the DHCP Relay Agent
A DHCP Relay Agent is a device that forwards DHCP packets between clients and servers when they are not on
the same physical LAN segment or IP subnet. The feature is enabled if the DHCP server IP address and a set of
access ports are configured.
DHCP Option 82 provides a mechanism for assigning an IP Address based on the location of the client device in
the network. Information about the client's location can be sent along with the DHCP request to the server. Based
on this information, the DHCP server makes a decision about an IP Address to be assigned.
DHCP Relay Agent takes the broadcast DHCP requests from clients received on the configured access port and
inserts the relay agent information option (Option 82) into the packet. Option 82 contains the VLAN ID (2 bytes)
and the port number of the access port (2 bytes: the circuit ID sub-option) and the switch's MAC address (the
remote ID sub-option). This information uniquely defines the access port's position in the network. For example,
the Circuit ID for VLAN 1 on port 1 is 00:01:00:01.
The DHCP Server supporting DHCP Option 82 sends a unicast reply and echoes Option 82. The DHCP Relay
Agent removes the Option 82 field and broadcasts the packet to the port from which the original request was
received.
These parameters provide the ability to configure the switch to act as a relay agent for DHCP Option 82.
The DHCP Relay Agent communicates to the server on a management interface. The agent's IP address is the
address configured for the management interface.
To configure the DHCP Relay Agent, do the following:
1.
Navigate to Administration » Configure DHCP Relay Agent. The DHCP Relay Agent form appears.
Configuring the DHCP Relay Agent
Chapter 5
Setup and Configuration
121
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