Planning to upgrade my network infastructure from 2950's to a 3560 command switch with a cluster of 2950's however before doing this I need to be sure that the DHCP requests to the 2K3 servers will be passed as I am planning to put the switches on a separate network (IP range). I do not want to enable DHCP server on the switch however I do want it to route the requests is there a way of enabling only the DHCP relay agent without the DHCP server? If not and I enable both without configuring an IP scope for the server will this be sufficient to route the reuqests?
What you want is ip helper-address 192.168.1.255 under the router interface for each vlan/subnet. If your 3560 is configured as the router this will be used with vlan interfaces.
This command will relay DHCP requests to the DHCP server. You can use a unicast address or a broadcast address as in my example. If you use a broadcast you need ip directed-broadcast enabled on the server subnet.
Thanks I know about the IP helper-address however my worry is about the DHCP serevr side as i do not want this to function but that and the DHCP relay are linked together it seems you cannot have one without the other.
I am planning to add the command
ip helper-address 10.217.100.0
to route the requests to my DHCP servers sitting on that network.
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