User guide

11-16 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
IP U
NICAST
R
OUTING
C
ONFIGURING
DHCP/BOOTP R
ELAY
Once IP unicast routing is configured, you can configure the switch to forward Dynamic
Host Configuration Protocol (DHCP) or BOOTP requests coming from clients on
subnets being serviced by the switch and going to hosts on different subnets. This
feature can be used in various applications, including DHCP services between Windows
NT servers and clients running Windows 95. To configure the relay function, do the
following:
1 Configure VLANs and IP unicast routing.
2 Enable the DHCP or BOOTP relay function, using the following command:
enable bootprelay
3 Configure the addresses to which DHCP or BOOTP requests should be directed,
using the following command:
config bootprelay add <ipaddress>
To delete an entry, use the following command:
config bootprelay delete {<ipaddress> | all}
V
ERIFYING THE
DHCP/BOOTP R
ELAY
C
ONFIGURATION
To verify the DHCP/BOOTP relay configuration, use the following command:
show ipconfig
This command displays the configuration of the BOOTP relay service, and the
addresses that are currently configured.
UDP-F
ORWARDING
UDP-forwarding is a flexible and generalized routing utility for handling the directed
forwarding of broadcast UDP packets. UDP-forwarding allows applications, such as
multiple DHCP relay services from differing sets of VLANs, to be directed to different
DHCP servers. The following rules apply to UDP broadcast packets handled by this
feature:
• If the UDP profile includes BOOTP or DHCP, it is handled according to guidelines in
RFC 1542.