Administering UDP Helper 7-11
Administering UDP Helper
UDP Helper allows you to send User Datagram Protocol (UDP) packets
between routed networks. UDP Helper provides support for UDP services
such as BOOTP or DHCP (Dynamic Host Configuration Protocol), that rely on
the BOOTP relay agent. For example, by configuring the logical BOOTP port,
you can boot hosts through the router. It also provides a relay agent for
DHCP broadcasts. UDP packets that rely on the BOOTP relay agent are
modified and then forwarded through the router.
The following are the ports for the UDP services mentioned in this section
on UDP Helper:
■BOOTP (including DHCP) = 67
■TIME = 37
■DNS = 53
UDP Helper allows you to configure the amount of time a UDP packet is
forwarded between subnetworks. UDP packets are discarded based on the
hop count and seconds value only for BOOTP and DHCP.
Displaying UDP
Helper Information
You can display the Hop and Threshold configuration and list the ports with
their IP forwarding addresses that are defined for each switching module in
your LANplex system.
To display UDP Helper information:
1From the Administration Console top-level menu, enter:
ip udpHelper display
2Enter the slot(s) of the switching module(s) for which you want to display
the UDP Helper information. Separate non-consecutive slots with commas
(,). Enter a consecutive series of slots using a dash (-).
The contents of the UDP Helper are displayed as shown in the example
below.
Slot 3- IP forwarding is enabled, BOOTP relay hopcount limit is 4,
BOOTP relay threshold is 0.
UDP port forwarding address
67 <158.101.1.112
Top-Level Menu
system
ethernet
fddi
tokenring
bridge
➧ip
ipx
appletalk
snmp
analyzer
script
logout
interface
route
arp
➧udpHelper
forwarding
rip
ping
statistics
➧display
define
remove
hopCountLimit
threshold