Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 9 DHCP Configuration Commands
3Com Corporation
9-54
Related command: dhcp select interface.
Example
# Add two relay IP addresses on Ethernet 0/0/0.
[3Com-Ethernet0/0/0] ip relay address 202.38.1.2
[3Com-Ethernet0/0/0] ip relay address 202.38.1.3
9.3.9 ip relay address cycle
Syntax
ip relay address cycle
undo ip relay address cycle
View
System view
Parameter
None
Description
Use the ip relay address cycle command to enable the DHCP relay to allocate
servers using the load sharing approach, where the HASH algorithm applies allowing
different clients to use different DHCP servers and the same client to use the same
DHCP server so long as it is possible.
Use the undo ip relay address cycle command to enable the DHCP relay to relay
client requests to all the DHCP servers by broadcasting.
A user is assigned to a server by the DHCP relay based on its MAC address and only
when this MAC address changes may this server be different. That means, a user is
associated with only one DHCP server, but one DHCP server can be associated with
multiple users. With this mechanism, the users of a server may be unable to obtain
addresses after the server fails because they are not assigned to other servers. Two
solutions are available for addressing this problem: recover the server, or delete the
configuration of the server from the DHCP Relay to allow the Relay to assign the users
to other servers.
By default, broadcast applies.
Related command: ip relay address.
Example
# Enable the DHCP Relay to assign servers in the load sharing approach.