Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 9 DHCP Configuration Commands
3Com Corporation
9-53
Description
Use the display dhcprelay-security command to display the IP-to-MAC mappings of
the clients obtaining IP addresses dynamically through the DHCP relay.
Example
# Display the IP-to-MAC mappings of the clients obtaining IP addresses dynamically
through the DHCP relay.
[Router] display dhcprelay-security
IP Address MAC Address IP Address Type
30.30.0.2 0000-0000-0000 Dynamic
9.3.8 ip relay address (in Interface View)
Syntax
ip relay address ip-address
undo ip relay address [ ip-address ]
View
Interface view
Parameter
ip-address: IP relay address in dotted decimal format.
Description
Use the ip relay address command to specify the exact location of a DHCP server by
configuring an IP relay address for it on the current interface.
Use the undo ip relay address command to delete one or all relay IP addresses used
by an interface.
By default, no relay IP address has been configured.
Executing undo ip relay address without ip-address will delete all the relay IP
addresses configured on the current interface.
 Note:
As the packets sent by DHCP client machines in some phases of DHCP are broadcast
packets, the interfaces configured with relay IP addresses must support broadcast. In
other words, this command can be used on the broadcast-supported network
interfaces, Ethernet interfaces for example.