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alexanderfefelov/gist:df3c562ea2e42438c940

Created August 29, 2014 06:41
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How to configure a Cisco Catalyst switch to act as a DHCP relay agent with option 82
Raw
gistfile1.md 
  +-------------+
  |             |
  | DHCP server |
  |             |
  +-------------+
          | 192.168.1.34
          |
          |
   VLAN 1 | 192.168.1.12
  +------[1]----+
  |             | Cisco Catalyst 2960 IOS 12.2(55)SE5
  | DHCP relay  | 00:1A:A1:D3:91:00
  |             |
  +-----[24]----+
 VLAN 996 | 192.168.78.5
          |
          |
          |
  +-------------+
  |             |
  | DHCP client |
  |             |
  +-------------+
  
interface Vlan1
    ip address 192.168.1.12 255.255.255.0
vlan 996
interface Vlan996
    ip address 192.168.78.5 255.255.255.0
    ip helper-address 192.168.1.34
interface FastEthernet0/24
    switchport mode access
    switchport access vlan 996
service dhcp
ip dhcp snooping
ip dhcp snooping vlan 996
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