==== Enable DHCP.====

# Specify IP addresses for the interfaces (omitted).
  
  
  <SwitchA> system-view
  [SwitchA] dhcp enable
  # Add DHCP server 10.1.1.1 into DHCP server group 1.
  [SwitchA] dhcp relay server-group 1 ip 10.1.1.1 
  # Enable the DHCP relay agent on VLAN-interface 1.
  [SwitchA] interface vlan-interface 1
  [SwitchA-Vlan-interface1] dhcp select relay
  # Correlate VLAN-interface 1 to DHCP server group 1.
  [SwitchA-Vlan-interface1] dhcp relay server-select 1 
  

----
 
**Cause :** The DHCP RELAY security table can become corrupt with multiple entries for the 
same IP address. 

**Fix :** Upgrade the switch software as follows: 

**Switch 4800G:** Version 5.20.R2202P15 or later

**Switch 5800:**  Version 5.20.R1109 

  <4800G>system-view 
  [4800G] dhcp enable 
  [4800G] dhcp relay server-group ip 
  [4800G] interface vlan 
  [4800G-vlan-interfaceN] dhcp relay server-select You need to configure the DHCP Relay 
  on each interface VLAN that you want to use the DHCP server. Regards This message was
  edited by Fred_Mancen on 10-8-09 @ 10:58