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Configuring UDP helper
Overview
UDP helper can provide the following packet conversion for packets with specific UDP destination
port numbers:
• Convert broadcast to unicast, and forward the unicast packets to specific destinations.
• Convert broadcast to multicast, and forward the multicast packets.
• Convert multicast to broadcast or unicast, and forward the broadcast or unicast packets.
Feature and hardware compatibility
Hardware UDP helper compatibility
MSR954(JH296A/JH297A/JH298A/JH299A) No
MSR1002-4/1003-8S Yes
MSR2003 Yes
MSR2004-24/2004-48 Yes
MSR3012/3024/3044/3064 Yes
MSR4060/4080 Yes
Configuration restrictions and guidelines
When you configure UDP helper, follow these restrictions and guidelines:
• By default, an interface on the device does not receive directed broadcasts destined for the
directly connected network. To use UDP helper, execute the ip forward-broadcast command.
For more information about receiving directed broadcasts destined for the directly connected
network, see "Optimizing IP performance."
• Do not set UDP
ports 67 and 68 for UDP helper, because UDP helper cannot forward DHCP
broadcast packets.
• You can specify a maximum of 256 UDP ports for UDP helper.
• You can specify a maximum of 20 unicast and multicast addresses for UDP helper to convert
broadcast packets on an interface.
• You can map one multicast address to a maximum of 16 broadcast and unicast addresses for
UDP helper to convert multicast packets on an interface.
Configuring UDP helper to convert broadcast to
unicast
You can configure UDP helper to convert broadcast packets with specific UDP port numbers to
unicast packets.
Upon receiving a UDP broadcast packet, UDP helper uses the configured UDP ports to match the
UDP destination port number of the packet.
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