Chesapeake NetCraftsmen

One of my consulting customers pointed something out to me that I hadn't known. IP helper (now DHCP relay) works differently on the Nexus 7000 than on the 6500. The N7K imposes a VACL to filter local DHCP broadcast traffic, under the assumption that you'd be using DHCP relay when there is no local DHCP server. So if you are planning on using a local DHCP server with the DHCP relay (former helper) address providing fallback to a remote DHCP server, you need to put in a DHCP relay line for the local server as well as the remote one. 

For full details and a configuration example, see https://supportforums.cisco.com/docs/DOC-14753.

Here is my version of the configuration example provided:

interface vlan 10
  ip address 10.1.1.1 255.255.255.0
  ip dhcp relay 11.2.3.4  ! remote DHCP server
  ip dhcp relay 10.1.1.2  ! localDHCP  server

Comments (2)

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Additional domain Controller ip to be allowed for DHCP relay. Nexus core Switch
written by Murthy Kanuri, May 02, 2013

HI,

I have Nexus core switch's (7000), And i need to configure the domain Controller ip to be allowed for DHCP relay.

Pls suggest the steps for the same.

With Regards

Murthy Kanuri

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Reply to Murthy
written by Peter Welcher, May 07, 2013

So put the domain controller IP into an "ip dhcp relay" statement per the above?

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