3com 5500-ei pwr Instrução De Instalação

 

6-2 

Follow these steps to configure a DHCP/BOOTP client: 

Enter system view 

— 

Enter VLAN interface view 

interface vlan-interface 
vlan-id 

— 

Configure the VLAN interface 
to obtain IP address through 
DHCP or BOOTP 

ip address { bootp-alloc | 
dhcp-alloc } 

Required 

By default, no IP address is 
configured for the VLAN 
interface. 

 

z 

Currently, an S5500-EI Ethernet switch functioning as the DHCP client can use an IP address for 

24 days at most. That is, the DHCP client can obtain an address lease for no more than 24 days 

even though the DHCP server offers a longer lease period. 

z 

An S5500-EI Ethernet switch functioning as a DHCP client supports default route creation. That is, 

the DHCP client creates a default route with the next hop being the gateway assigned by the DHCP 

server. To view detailed information about the default route, run the display ip routing-table 

command on the switch. 

z 

If a switch belongs to an XRN fabric, you need to enable the UDP Helper function on the switch 

before configuring its VLAN interfaces to obtain IP addresses through DHCP. 

z 

An S5500-EI Ethernet switch functioning as a DHCP client supports default route creation. That is, 

the DHCP client creates a default route with the next hop being the gateway assigned by the DHCP 

server. To view detailed information about the default route, run the display ip routing-table 

command on the switch. 

 

To improve security and avoid malicious attack to the unused SOCKETs, S5500-EI Ethernet switches 

provide the following functions: 

z 

UDP 67 and UDP 68 ports used by DHCP are enabled only when DHCP is enabled.  

z 

UDP 67 and UDP 68 ports are disabled when DHCP is disabled.  

The specific implementation is: 

z 

Using the ip address dhcp-alloc command enables the DHCP client, and UDP port 68. 

z 

Using the undo ip address dhcp-alloc command disables the DHCP client, and UDP port 68.