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port
Syntax of the "no" Form
The no form of this command removes a UDP port or UDP protocol. If the UDP protocol is
removed, UDP forwarding is disabled.
no ip forward-protocol {udp [port]}
Mode
Global configuration:
Defaults
Enabled, but no port specified. This acts as a BOOTP forwarding agent. The above list of ports is
used by default for forwarding.
Examples
The following example, as shown in Figure
Internet:
XSR(config)#ip forward-protocol udp
XSR(config)#interface fastethernet 1
XSR(config-if<F1>)#ip helper-address 196.1.1.255
This example removes DNS from the list of ports for which UDP broadcast forwarding is done:
XSR(config)#no ip forward-protocol udp 53
Host
Destination: 195.1.1.255
Destination port that controls which UDP services are forwarded. If not
set, forwarding is done on the following default ports:
•
Trivial File Transfer Protocol (TFTP) (port 69)
•
Domain Naming System (port 53)
•
Time service (port 37)
•
NetBIOS Name Server (port 137)
•
NetBIOS Datagram Server (port 138)
•
Boot Protocol (BTP) client and server datagrams (ports 67, 68)
•
TACACS service (port 49)
•
IEN‐116 Name Service (port 42)
XSR(config)#
Figure 5-6
Router 1
195.1.1.0
eth 1
1
Global Configuration
ip forward-protocol UDP
interface ethernet 1
ip helper-address 196.1.1.255
5‐6, forwards UDP traffic to a router across the
IP Forward-Protocol Example
INTERNET
Other IP Commands
Router 2
196.1.1.0
2
XSR CLI Reference Guide 5-157
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