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IP Addressing Commands
Cisco Sx350 Ph. 2.2.5 Devices - Command Line Interface Reference Guide
•
address
—Specifies the destination broadcast or host address to which to
forward UDP broadcast packets. A value of 0.0.0.0 specifies that UDP
broadcast packets are not forwarded to any host.
•
udp-port-list
—Specifies the destination UDP port number to which to
forward Broadcast packets. (Range: 1–65535). This can be a list of port
numbers separated by spaces.
Default Configuration
Forwarding of UDP Broadcast packets received on an interface to a specific
(helper) address is disabled.
If udp-port-list is not specified, packets for the default services are forwarded to
the helper address.
Command Mode
Global Configuration mode
User Guidelines
This command forwards specific UDP Broadcast packets from one interface to
another, by specifying a UDP port number to which UDP broadcast packets with
that destination port number are forwarded. By default, if no UDP port number is
specified, the device forwards UDP broadcast packets for the following six
services:
•
IEN-116 Name Service (port 42)
•
DNS (port 53)
•
NetBIOS Name Server (port 137)
•
NetBIOS Datagram Server (port 138)
•
TACACS Server (port 49)
•
Time Service (port 37)
Many helper addresses may be defined. However, the total number of
address-port pairs is limited to 128 for the device.
The setting of a helper address for a specific interface has precedence over the
setting of a helper address for all the interfaces.
Forwarding of BOOTP/DHCP (ports 67, 68) cannot be enabled with this command.
Use the DHCP relay commands to relay BOOTP/DHCP packets.
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