User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
11-17
UDP-F
ORWARDING
• If the UDP profile includes other types of traffic, these packets have the IP
destination address modified as configured, and changes are made to the IP and
UDP checksums and decrements to the TTL field, as appropriate.
If the UDP-forwarding is used for BOOTP or DHCP forwarding purposes, do not
configure or use the existing
bootprelay
function. However, if the previous
bootprelay
functions are adequate, you may continue to use them.
C
ONFIGURING
UDP-F
ORWARDING
To configure UPD-forwarding, the first thing you must do is create a UDP-forward
destination profile. The profile describes the types of UDP packets (by port number)
that are used, and where they are to be forwarded. You must give the profile a unique
name, in the same manner as a VLAN, protocol filter, or Spanning Tree Domain.
Next, configure a VLAN to make use of the UDP-forwarding profile. As a result, all
incoming traffic from the VLAN that matches the UDP profile is handled as specified in
the UDP-forwarding profile.
A maximum of ten UDP-forwarding profiles can be defined. Each named profile may
contain a maximum of eight “rules” defining the UDP port, and destination IP address
or VLAN. A VLAN can make use of a single UDP-forwarding profile. UDP packets
directed toward a VLAN use an all-ones broadcast on that VLAN.
UPD-F
ORWARDING
E
XAMPLE
In this example, the VLAN Marketing and the VLAN Operations are pointed toward a
specific backbone DHCP server (with IP address 10.1.1.1) and a backup server (with IP
address 10.1.1.2). Additionally, the VLAN LabUser is configured to use any responding
DHCP server on a separate VLAN called LabSvrs.
The commands for this configuration are as follows:
create udp-profile backbonedhcp
create udp-profile labdhcp
config backbonedhcp add 67 ipaddress 10.1.1.1
config backbonedhcp add 67 ipaddress 10.1.1.2
config labdhcp add 67 vlan labsvrs
config marketing udp-profile backbonedhcp
config operations udp-profile backbonedhcp
config labuser udp-profile labdhcp