3com 5500-ei pwr Instruccion De Instalación

 

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On an S5500-EI Series Ethernet Switch, the reception of directed broadcast packets to a directly 

connected network is disabled by default. As a result, UDP Helper is available only when the ip 

forward-broadcast command is configured in system view. For details about the ip 

forward-broadcast command, refer to the IP Address and Performance part of this manual. 

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You need to enable UDP Helper before specifying any UDP port to match UDP broadcasts; 

otherwise, the configuration fails. When the UDP helper function is disabled, all configured UDP 

ports are disabled, including the default ports. 

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The dns, netbios-ds, netbios-ns, tacacs, tftp, and time keywords correspond to the six default 

ports. You can configure the default ports by specifying port numbers or the corresponding 

parameters. For example, udp-helper port 53 and udp-helper port dns specify the same port. 

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You can specify up to 20 destination server addresses on a VLAN interface. 

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If UDP Helper is enabled after a destination server is configured for a VLAN interface, the 

broadcasts from interfaces belonging to the VLAN and having a matching UDP port will be unicast 

to the destination server. 

 

Display the UDP broadcast 
relay forwarding information of 
a specified VLAN interface on 
the switch 

display udp-helper server 
[ interface vlan-interface 
vlan-id ] 

Available in any view 

Clear statistics about packets 
forwarded by UDP Helper 

reset udp-helper packet 

Available in user view 

 

PC A resides on network segment 192.168.1.0/24 and PC B on 192.168.10.0/24; they are connected 

through Switch A and are routable to each other. It is required to configure UDP Helper on the switch, so 

that PC A can find PC B through computer search. (Broadcasts with UDP port 137 are used for 

searching.)