I've fixed this issue at a number of customers by doing one of two things, depending on the installation. You can create a new vlan on the network with a new set of IP addresses, then create a new scope on your DHCP server then setup ip helpers in your layer 3 switch so DHCP requests get forwarded to your single DHCP server.
interface vlan.0.370 ip address 10.1.7.1 255.255.255.0 primary no shutdown exit interface vlan.0.380 ip address 10.1.8.1 255.255.255.0 primary ip helper-address 10.1.7.10 ip helper-address 10.1.7.11 no shutdown exit Or, the easier method IMHO, especially if you don't have a layer 3 switch, is to just change the subnet mask on the network. For example, if you are using 255.255.255.0, you can change it to 255.255.254.0 to double your ip address space or 255.255.252.0 to quadruple your ip address space. Do calculations before you do this so you know what new IP addresses are available to you. For example, if you're using 192.168.1.0 as your network and you expand the subnet mask from 255.255.255.0 to 255.255.254.0, you must use 192.168.0.0, not 192.168.2.0. In CIDR terms, 192.168.1.0/24 expanded to /23 becomes 192.168.0.0/23. Does this make sense? I'll be happy to help if you need clarification or calculations. Stephen Loeckle Lucid Networks From: Jeremy Bullock <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Wednesday, August 21, 2013 9:44 AM To: Enterasys Customer Mailing List <[email protected]<mailto:[email protected]>> Subject: [enterasys] Secondary Subnet We are experiencing a 100% DHCP use on one of our subnets/VLANs. If I add a secondary subnet to that VLAN, will the client attempt to get a primary address, fail and then use the secondary subnet for an IP? * --To unsubscribe from enterasys, send email to [email protected]<mailto:[email protected]> with the body: unsubscribe enterasys [email protected]<mailto:[email protected]> --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected]
