C2950 and the command ip dhcp-server and ip helper-address x.x.x.x

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Aug 14th, 2008

I have this problem too.
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m.glosson Sat, 08/16/2008 - 06:37

A 2950 is only a layer-2 switch. Therefore these commands serve no purpose as they are meant to forward dhcp/bootp requests on a layer-3 interface to a remote device. Further, the 2950 cannot act as a dhcp-server.

dhananjoy chowdhury Sat, 08/16/2008 - 12:09

ip dhcp-server >> it specifies the IP of the DHCP server, and only forwards/realy the dhcp request as broadcast.

ip helper-address >> this is on L3 devices, it converts the DHCP requests (Broadcast) to a Unicast packet and forwards the Unicast packet to the DHCP server.

Richard Burts Sat, 08/16/2008 - 14:15

Matt and dhananjoy

I am not able to speak to the ip dhcp-server issue but I do have some experience with the ip helper-address on a 2950. I originally also thought that as a layer 2 device that ip helper-address would not be valid. But I tested it and the command is accepted and appears to be valid. Another person describes in this thread:


that he tested it and that the ip helper-address did work correctly on a 2950.




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