D-Link DXS-3600 Series Reference Manual page 606

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
Default
Common used application protocols are enabled.
Command Mode
Global Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
The following is a listing of the commonly used application protocols that will be forwarded by default if
the IP helper address is configured. If the command or the no form of the command is configured without
specifying the port number, then the default ports are applied. BOOTP UDP port 67 and 68 cannot be
specified as the packets are forwarded by DHCP relay. Default ports are:
•
Trivial File Transfer Protocol (TFTP) port 69.
•
Domain Naming System (DNS) port 53.
•
Time service port 37.
•
NetBIOS Name Server port 137.
•
NetBIOS Datagram Server port 138.
•
TACACS service port 49.
•
IEN-116 Name Service port 42.
Example
This example shows how the IP helper address is configured to 172.50.71.123 for VLAN 100. IP helper
forwarding of UDP port 53 (DNS) is disabled.
Switch# configure terminal
Switch(config)# interface vlan 100
switch(config-if)# ip helper-address 172.50.71.123
switch(config-if)# exit
switch(config)# no ip forward-protocol udp 53
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