3com 5500-ei pwr Instrução De Instalação

 

1-2 

Table 1-1 List of default UDP ports 

DNS (Domain Name System) 

53 

NetBIOS-DS (NetBIOS Datagram Service) 

138 

NetBIOS-NS (NetBIOS Name Service) 

137 

TACACS (Terminal Access Controller Access Control System) 

49 

TFTP (Trivial File Transfer Protocol) 

69 

Time Service 

37 

 

Follow these steps to configure UDP Helper: 

Enter system view 

system-view 

— 

Enable UDP Helper 

udp-helper enable 

Required 

Disabled by default. 

Specify a UDP port number 

udp-helper port { port-number 
| dns | netbios-ds | netbios-ns 
| tacacs | tftp | time } 

Optional 

By default, the device enabled 
with UDP Helper forwards the 
broadcast packets containing 
any of the six port numbers 53, 
138, 137, 49, 69 and 37. 

Enable the UDP Helper 
TTL-keep function 

udp-helper ttl-keep enable 

Optional 

Disabled by default. That is, 
UDP Helper does not forward 
IP broadcasts with the TTL field 
being 1. 

Enter VLAN interface view 

interface Vlan-interface 
vlan-id 

— 

Specify the destination server 
to which the UDP packets are 
to be forwarded 

udp-helper server ip-address 

Required 

No destination server is 
specified by default.