There are no dumb questions. Lots of dumb answers, though ;-) We do this all the time when setting up Voice Vlans for AVVID. The configuration below details the operation of DHCP and the configuration required. You should be fine with the example you gave.
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a 0080114aee.shtml Frank Jimenez, CCIE #5738 Systems Engineer Dallas Commercial Cisco Systems, Inc. [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 19, 2002 7:18 PM To: [EMAIL PROTECTED] Subject: campus LAN design w/DHCP server [7:59578] Sorry if this is a dumb question! ;-) I want to make sure this design will work before implementing it. The customer has been using 192.168.168.0/24 in one small flat LAN. He has run out of these addresses and is being hit by performance issues related to broadcasts. He wants to implement subnets and VLANs: VLAN 100 192.168.168.0/24 VLAN 200 192.168.169.0/24 New design: Internet | s0 2600 router e1 --- public servers e0 | dot1q trunk switch VLAN 200 VLAN 100 There is just one DHCP server. It will be in VLAN 100, address 192.168.168.10. The DHCP server will have 2 scopes for the 2 subnets. We're going to do inter-VLAN routing on the 2600 router. Will this config work as far as DHCP is concerned? interface ethernet 0 no ip address interface ethernet 0.1 encapsulation dot1q 100 ip address 192.168.168.1 255.255.255.0 interface ethernet 0.2 encapsulation dot1q 200 ip address 192.168.169.1 255.255.255.0 ip helper-address 192.168.168.10 Devices in VLAN 100 will broadcast and get to the DHCP server directly. The DHCP server is in their VLAN/subnet. Devices in VLAN 200 will broadcast. The router will hopefully pick up the broadcast, convert it to a unicast to the DHCP server and send it back out e0, with the GIADDR address filled in so the server will use the right scope. Sounds like it should work, but for some unknown reason, I couldn't find an example that showed this. Thanks so much for your help. You could save my Christmas by helping me verify (or poke holes) in this design! I just wanted to check on the DHCP aspect at this point. I can fix up the NAT and routing. My brain stopped working after the last egg nog, so help is needed! :-) Priscilla Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=59616&t=59578 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
