Creating Subnets, DHCP Relay, Catalyst 6000, PIX, Catalyst 2948/2924

Feb 08, 2007 3 Replies
C

Hello All,



Fairly new to Cisco administering here and need some guidance on segmenting traffic on our flat network.



Scenario:



Internet Cisco 1800 router PIX Catalyst 6000 Catalyst 2948 and 2924



We're in a W2k3 environment with a dedicated DHCP server and one scope.



Currently the dorm users patch into a Cat2948 or Cat2924 for internet access. These users get their IP address from the DHCP server.



Goal:



We'd like to separate or segment users in the dorm onto a different subnet. I'm thinking that this can be achieved by creating Vlans for the dorms, set the cat29xx's up as a DHCP relay, then create a new scope within DHCP for these vlans.


From what I see on google groups this can be done. However, I don't

know where to begin or how to achieve this. Can anyone give me some guidance on this and\\or point me to good documenation?


Thanks all!

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S

DHCP relay happens at the subnet border, and a Cat 29xx doesnt route - so doesnt need to do DHCP relay.

If your Cat 6k has L3 in it, then you should set up the DHCP relay there.

I havent done this for a long time, so dont remember the exact commands - but the cisco web site has a good search engine and should find examples there.

dont forget to add a scope per subnet to the DHCP server, or nothing is going to work.....

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P

Greetings,

The basic steps you will need are - 1. Build the new DHCP scope on the server. 2. Enable layer 3 routing between the new Segments. Note that your

6500 would need Layer 3 capability for this. 3. Enable DHCP relay on the 2848/24 that has the new IP segment, pointing it at the DHCP Server.

I assume steps 1 & 2 are pretty straight forward for you, and for step

3, search the Cisco Web site for "Configuring DHCP Relay".

Cheers..............pk.

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C

Thanks guys. This is helpful. STep 1 is straightforward indeed. Step 2 is unclear to me how to achieve but I'll reach out to cisco documentation for scripting.

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