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Chapter 34
Configuring IP Unicast Routing
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
ip directed-broadcast [access-list-number]
Step 4
exit
Step 5
ip forward-protocol {udp [port] | nd | sdns} Specify which protocols and ports the router forwards when
Step 6
end
Step 7
show ip interface [interface-id]
or
show running-config
Step 8
copy running-config startup-config
Use the no ip directed-broadcast interface configuration command to disable translation of directed
broadcast to physical broadcasts. Use the no ip forward-protocol global configuration command to
remove a protocol or port.
Forwarding UDP Broadcast Packets and Protocols
User Datagram Protocol (UDP) is an IP host-to-host layer protocol, as is TCP. UDP provides a
low-overhead, connectionless session between two end systems and does not provide for
acknowledgment of received datagrams. Network hosts occasionally use UDP broadcasts to find
address, configuration, and name information. If such a host is on a network segment that does not
include a server, UDP broadcasts are normally not forwarded. You can remedy this situation by
configuring an interface on a router to forward certain classes of broadcasts to a helper address. You can
use more than one helper address per interface.
You can specify a UDP destination port to control which UDP services are forwarded. You can specify
multiple UDP protocols. You can also specify the Network Disk (ND) protocol, which is used by older
diskless Sun workstations and the network security protocol SDNS.
OL-8915-03
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to
configure.
Enable directed broadcast-to-physical broadcast translation on the
interface. You can include an access list to control which broadcasts
are forwarded. When an access list, only IP packets permitted by the
access list can be translated
The ip directed-broadcast interface configuration command
Note
can be configured on a VPN routing/forwarding(VRF)
interface and is VRF-aware. Directed broadcast traffic is
routed only within the VRF.
Return to global configuration mode.
forwarding broadcast packets.
udp—Forward UPD datagrams.
•
port: (Optional) Destination port that controls which UDP
services are forwarded.
nd—Forward ND datagrams.
•
sdns—Forward SDNS datagrams
•
Return to privileged EXEC mode.
Verify the configuration on the interface or all interfaces.
(Optional) Save your entries in the configuration file.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring IP Addressing
34-13
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Troubleshooting
