Dell S4048T, Configuration Manual

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UDP Helper
User datagram protocol (UDP) helper allows you to direct the forwarding IP/UDP broadcast traffic by creating
special broadcast addresses and rewriting the destination IP address of packets to match those addresses.
Configure UDP Helper
To configure Dell Networking OS to direct UDP broadcast, enable UDP helper and specify the UDP ports for
which traffic is forwarded. See
Enabling UDP Helper
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
IPv4 Routing 512