Dell S4820T, Configuration Manual

Page: 494 / 1178

1. Enable UDP helper and specify the UDP ports for which traffic is forwarded. Refer to Enabling UDP
Helper .
2. Configure a broadcast address on interfaces that will receive UDP broadcast traffic. Refer to
Configuring a Broadcast Address .
Important Points to Remember
• The existing
ip directed broadcast
command is rendered meaningless if you enable UDP helper
on the same interface.
• The broadcast traffic rate should not exceed 200 packets per second when you enable UDP helper.
• You may specify a maximum of 16 UDP ports.
• UDP helper is compatible with IP helper (
ip helper-address
):
– UDP broadcast traffic with port number 67 or 68 are unicast to the dynamic host configuration
protocol (DHCP) server per the
ip helper-address
configuration whether or not the UDP port
list contains those ports.
– If the UDP port list contains ports 67 or 68, UDP broadcast traffic is forwarded on those ports.
Enabling UDP Helper
To enable UDP helper, use the following command.
• Enable UPD helper.
ip udp-helper udp-ports
Example of Enabling UDP Helper and Using the UDP Helper
show
Command
Dell(conf-if-te-1/1)#ip udp-helper udp-port 1000
Dell(conf-if-te-1/1)#show config
!
interface TenGigabitEthernet 1/1
ip address 2.1.1.1/24
ip udp-helper udp-port 1000
no shutdown
To view the interfaces and ports on which you enabled UDP helper, use the
show ip udp-helper
command from EXEC Privilege mode.
Dell#show ip udp-helper
--------------------------------------------------
Port UDP port list
--------------------------------------------------
te 1/1 1000
Configuring a Broadcast Address
To configure a broadcast address, use the following command.
• Configure a broadcast address on an interface.
ip udp-broadcast-address
Examples of Configuring and Viewing a Broadcast Address
Dell(conf-if-vl-100)#ip udp-broadcast-address 1.1.255.255
Dell(conf-if-vl-100)#show config
494
IPv4 Routing