ACI DHCP Relay

[iwearing]

Hi,

I have an EPG configured in a User Tenant with a requirement to access a DHCP server located Externally over a L3Out. The EPG and L3Out are both in the same Tenant-VRF.

I have created a DHCP Relay Provider within the User Tenant with the EPG type set as L3 External Network.

The relevant BD in the User Tenant has been configured to Consume the DHCP Relay Provider.

Hosts within the EPG are unable to obtain DHCP allocated IP addresses.

Hosts within the EPG are able to Ping the DHCP server. ACI Firmware Ver 2.2.2f.

Any advice would be appreciated.

thanks

Ian

[Tomas de Leon]

Ian,

* What OS and Version is your DHCP Server running?

* Your DHCP Server needs to support DHCP Option 82

* Please gather a wireshark traces from the DHCP Client and DHCP Server? Does the DHCP Server see the DHCP DISCOVER from Client? Does the DHCP Server Make an OFFER?

FOR ADDITIONAL INFO REFER TO:

TECHNOTE on DHCP Relay in ACI: Overview, Configuration, Troubleshooting, & Caveats\Issues
https://supportforums.cisco.com/document/12727046/technote-dhcp-relay-aci-overview-configuration-troubleshooting-caveatsissues

Ask the ACI Experts: DHCP-Relay in the ACI Fabric
https://supportforums.cisco.com/blog/13100736/ask-aci-experts-dhcp-relay-aci-fabric

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Thank you!

T.

[iwearing]

Tomas,

Thanks for taking the time to respond. The ACI fabric policies were configured correctly. I had wireshark traces running on the client and the DHCP server. The Server never received the DHCP discovery packets.

As it turned out, DHCP discovery packets were being tested using a MS DHCP utility. When I attached another host onto the fabric configured for DHCP it worked.

All working as expected now.

thanks

Ian