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IP Routing Features
UDP Broadcast Forwarding
Operating Notes for UDP Broadcast Forwarding
Maximum Number of Entries. The number of UDP broadcast entries and
IP helper addresses combined can be up to 16 per VLAN, with an overall
maximum of 2048 on the switch. (IP helper addresses are used with the
switch’s DHCP Relay operation. For more information, refer to “Configuring
DHCP Relay” on page 3-43.) For example, if VLAN 1 has 2 IP helper addresses
configured, you can add up to 14 UDP forwarding entries in the same VLAN.
TCP/UDP Port Number Ranges. There are three ranges:
• Well-Known Ports: 0 - 1023
• Registered Ports: 1024 - 49151
• Dynamic and/or Private Ports: 49152 - 65535
For more information, including a listing of UDP/TCP port numbers, go to the
Internet Assigned Numbers Authority (IANA) website at:
www.iana.org
Then click on:
Protocol Number Assignment Services
P (Under “Directory of General Assigned Numbers” heading)
Port Numbers
Messages Related to UDP Broadcast Forwarding
Message Meaning
udp-bcast-forward: IP Routing
support must be enabled first.
Appears in the CLI if an attempt to enable UDP broadcast
forwarding has been made without IP routing being enabled first.
Enable IP routing, then enable UDP broadcast forwarding.
UDP broadcast forwarder feature
enabled
UDP broadcast forwarding has been globally enabled on the router.
Appears in the Event Log and, if configured, in SNMP traps.
UDP broadcast forwarder feature
disabled
UDP broadcast forwarding has been globally disabled on the
routing switch. This action does not prevent you from configuring
UDP broadcast forwarding addresses, but does prevent UDP
broadcast forwarding operation. Appears in the Event Log and, if
configured, in SNMP traps.
UDP broadcast forwarder must be
disabled first.
Appears in the CLI if you attempt to disable routing while UDP
forwarding is enabled on the switch.
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