Overview, Configuration, Troubleshooting, and Caveats\Issues
DHCP Relay Overview
While ACI fabric-wide flooding is disabled by default, flooding within a bridge domain is enabled by default. Because flooding within a bridge domain is enabled by default, clients can connect to DHCP servers within the same EPG. However, when the DHCP server is in a different EPG, BD, or context (VRF) than the clients, DHCP Relay is required. Also, when Layer 2 flooding is disabled, DHCP Relay is required.
This attached document has all of the details related to "DHCP Relay in ACI"
Version 10, updated August 21, 2017
The latest technote revision contains updates in regards to "Option 82 Suboption: Link selection” support in Windows 2016 Server. And I have added some notes on Infoblox DHCP Services in an ACI Deployment.
Note: If you use Windows 2016 Server in an "INTER-VRF" setup, Microsoft requires you to setup a "dhcp scope" for the "Server's" local subnet before it will server DHCP addresses. If you do NOT setup a local DHCP scope, your DHCP requests can get a NACK DHCP Response.
Hi We have a Nexus5648 running on 7.3(3)N1(1) and a few Nexus2348 switches have FEX uplinks to the N5K in production. I am planning to add one more new Nexus 2348 to the Nexus 5648 via FEX. Just waned to confirm if production outage is exp...
Hi, Can someone clear me the below questions regarding Standard contracts and Taboo contracts : 1) As i get tell now that when i create a standard contract filters, i can choose actions at subject for filters (deny or permit)Based on this ...
Hello,I am facing a weird situation with a thin client (HP) T630 that does not connect to a FEX N2K-2348UPQ, these clients have fiber(1gig) NIC cards. HP has a similar model T620 which connects without any issues. These connections work fine in our ...
I am trying to understand how exact ACI DHCP relay works. After reading the ACI DHCP relay technote, I still have questions.
So I did the following tests, with dhcp_server in epg-A (tn-A, app-A, ctx-A, BD-A, subnet-[A]), and dhcp_client ...