Chapter 30
| IP Interface Commands
IPv4 Interface
– 919 –
UDP Helper
Configuration
User Datagram Protocol (UDP) Helper allows host applications to forward UDP
broadcast packets from this switch to another part of the network. This section
describes the commands used to configure UDP Helper.
ip forward-protocol
udp
This command specifies the UDP destination ports for which broadcast traffic will
be forwarded when the UDP helper is enabled. Use the no form to remove a UDP
port from the forwarding list.
Syntax
[no] ip forward-protocol udp destination-port
destination-port - UDP application port for which UDP service requests are
forwarded. (Range: 1-65535)
Default Setting
The following UDP ports are included in the forwarding list when UDP helper is
enabled with the ip helper command and a remote server address is configured
with the ip helper-address command:
BOOTP client port 67
BOOTP server port 68
Domain Name Service port 53
IEN-116 Name Service port 42
NetBIOS Datagram Server port 138
NetBIOS Name Server port 137
NTP port 37
TACACS service port 49
TFTP port 69
Command Mode
Global Configuration
Command Usage
Up to 100 UDP ports can be specified with this command for forwarding to one or
more remote servers.
Table 184: UDP Helper Commands
Command Function Mode
ip forward-protocol udp Specifies the UDP destination ports for which broadcast
traffic will be forwarded
GC
ip helper Enables UDP helper globally on the switch GC
ip helper-address Specifies the servers to which designated UDP protocol
packets are forwarded
IC
show ip helper Displays configuration settings for UDP helper PE
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