Show Ip Helper-Address - Cisco 300 Series Cli Manual

IP Addressing Commands
OL-32830-01 Command Line Interface Reference Guide
Command Mode
Global Configuration mode
User Guidelines
The command is supported only in router mode.
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.
Example
The following example enables the forwarding of UDP Broadcast packets
received on all interfaces to the UDP ports of a destination IP address and UDP
port 1 and 2.
switchxxxxxx(config)#

22.15 show ip helper-address

Use the show ip helper-address Privileged EXEC mode command to display the IP
helper addresses configuration on the system.
ip helper-address all
172.16.9.9 49 53 1 2
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