Dell PowerConnect B-RX Configuration Manual page 281

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NOTE
The application names are the names for these applications that the device recognizes, and might
not match the names for these applications on some third-party devices. The numbers listed in
parentheses are the UDP port numbers for the applications. The numbers come from RFC 1340.
NOTE
As shown above, forwarding support for BootP/DHCP is enabled by default. If you are configuring the
device to forward BootP/DHCP requests, refer to
on page 211.
You can enable forwarding for other applications by specifying the application port number.
You also can disable forwarding for an application.
NOTE
If you disable forwarding for a UDP application, forwarding of client requests received as broadcasts
to helper addresses is disabled. Disabling forwarding of an application does not disable other
support for the application. For example, if you disable forwarding of Telnet requests to helper
addresses, other Telnet support on the device is not also disabled.
Enabling forwarding for a UDP application
If you want the device to forward client requests for UDP applications that the device does not
forward by default, you can enable forwarding support for the port. To enable forwarding support
for a UDP application, use either of the following methods. You also can disable forwarding for an
application using these methods.
NOTE
You also must configure a helper address on the interface that is connected to the clients for the
application. The device cannot forward the requests unless you configure the helper address. Refer
to "Configuring an IP helper address"
To enable the forwarding of SNMP trap broadcasts, enter the following command.
BigIron RX(config)# ip forward-protocol udp snmp-trap
Syntax: [no] ip forward-protocol udp <udp-port-name> | <udp-port-num>
The <udp-port-name> parameter can have one of the following values. For reference, the
corresponding port numbers from RFC 1340 are shown in parentheses. If you specify an
application name, enter the name only, not the parentheses or the port number shown here:
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BigIron RX Series Configuration Guide
53-1001810-01
dns (port 53)
tftp (port 69)
time (port 37)
netbios-ns (port 137)
netbios-dgm (port 138)
tacacs (port 65)
bootpc (port 68)
bootps (port 67)
discard (port 9)
Configuring forwarding parameters
"Configuring BootP/DHCP forwarding parameters"
on page 212.
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