Siemens RUGGEDCOM ROX II User Manual page 265

RUGGEDCOM ROX II
CLI User Guide
Section 7.1.6.2
Deleting an IPv6 Network Prefix
To delete a network prefix to the neighbor discovery configuration for an IPv6 address, do the following:
1. Make sure the CLI is in Configuration mode.
2. Delete the address by typing:
no ip interface ipv6 address address
Where:
• interface is the name of the interface
• address is the IPv6 address
Type commit and press Enter to save the changes, or type revert and press Enter to abort.
3.
Section 7.2
Managing 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, in
RUGGEDCOM ROX II, the Circuit ID for VLAN 2 on Line Module (LM) 4 Port 15 is 00:00:00:02:04:0F.
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.
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.
RUGGEDCOM ROX II can be configured to act as a DHCP Relay Agent that forwards DHCP and BOOTP requests
from clients on one Layer 2 network to one or more configured DHCP servers on other networks. This allows the
implementation of some measure of isolation between DHCP clients and servers.
The DHCP Relay Agent is configured to listen for DHCP and BOOTP requests on particular Ethernet and VLAN
network interfaces, and to relay to a list of one or more DHCP servers. When a request is received from a client,
RUGGEDCOM ROX II forwards the request to each of the configured DHCP servers. When a reply is received from a
server, RUGGEDCOM ROX II forwards the reply back to the originating client.
NOTE
While DHCP Relay and DHCP Server may both be configured to run concurrently, they may not be
configured to run on the same network interface.
CONTENTS
• Section 7.2.1, "Configuring the DHCP Relay Agent"
Deleting an IPv6 Network Prefix
Chapter 7
IP Address Assignment
219