D-Link DGS-3130 Emulator - Page 467
show ip helper-address
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DGS-3130 Layer 3 Stackable Managed Switch CLI Reference Guide ip forward-protocol udp [PORT] no ip forward-protocol udp [PORT] Parameters PORT (Optional) Specifies the destination port of the UDP service to be forwarded or not forwarded. 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 Switch(config)# 41-6 show ip helper-address This command is used to display UDP helper address table. show ip helper-address [INTERFACE-ID] Parameters INTERFACE-ID (Optional) Specifies the VLAN's interface ID that will be used for the display. If no interface ID is specified, then all related interfaces' information will be displayed. 463