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DES-7200 Configuration Guide Chapter 6 UDP-Helper Configuration
6-5
Note
¾ UDP port for relay forwarding can only be configured
after UDP-Helper relay forwarding is enabled and the
destination server is configured, or else the error
message will be displayed.
¾ After enabling UDP relay forwarding, the device will
immediately forward UDP broadcast packets containing
the default port numbers of 69, 53, 37, 137, 138 and 49
without further configuration.
6.3.4 Configuration Steps
Before configuring relevant features of UDP-Helper, please make sure the route
from switch to network segment of UDP-Helper server is reachable. The IP
addresses configured on respective interfaces are shown in the topological
diagram. Here we will introduce how to configure relevant features of
UDP-Helper.
Step 1: Enable UDP-Helper relay forwarding on the Switch
DES-7200(config)#udp-helper enable
Step 2: Configure the IP address for the destination server of UDP-Helper relay
forwarding as 30.1.1.2 on SVI 10.
DES-7200(config)#vlan 10
DES-7200(config-vlan)#exit
DES-7200(config)#interface vlan 10
DES-7200(config-if-VLAN 10)#ip address 10.1.1.1 255.255.255.0
DES-7200(config-if-VLAN 10)# ip helper-address 30.1.1.2
DES-7200(config-if-VLAN 10)#exit
Step 3: Configure the Switch to forward UDP broadcast packets carrying the
destination port number of 1000.
DES-7200(config)#ip forward-protocol udp 1000
6.3.5 Verify
Configurations
¾ Display configurations of the switch. Key points: whether relay forwarding
is enabled or not; IP address of relay server; destination port number
carried in UPD broadcast packets requiring relay forwarding.
DES-7200#show run
!
udp-helper enable
!