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Layer 3 switch Connecting DHCP server and Desktop

Cisco10956
Level 1
Level 1

How does a DHCP server give a requesting “”workstation an IP address””  if each computer (server, workstation) are on two different subnets, ???  if server and workstation are connected into one Layer 3 switch.

Thanks

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Accepted Solutions

Reza Sharifi
Hall of Fame
Hall of Fame

Have a look at this document:

If the server and workstation are on 2 different subnets and the DHCP server is in the server subnet you need to add an ip helper-address command to the workstation vlan interface

 

http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/27470-100.html

HTH

View solution in original post

3 Replies 3

Reza Sharifi
Hall of Fame
Hall of Fame

Have a look at this document:

If the server and workstation are on 2 different subnets and the DHCP server is in the server subnet you need to add an ip helper-address command to the workstation vlan interface

 

http://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/27470-100.html

HTH

Sorry I made a mistake. I read the rest of the link. You are right. it appears in this case a DHCP service scope would be needed for each different subnet, then the different L3 vlans can communicate. Also the DHCP relay agent would also need to be used.

Cisco10956
Level 1
Level 1

This is what I used for the answer. 

http://chinnychukwudozie.com/2013/09/26/configuring-intervlan-routing-on-a-layer-3-switch-and-providing-dhcp-to-multiple-subnets-part-1/

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