topic Re: SDA with Extended Node / Windows Clients DHCP Decline in Software-Defined Access (SD-Access)

SDA with Extended Node / Windows Clients DHCP Decline

markus.forrer — Fri, 28 Aug 2020 09:15:44 GMT

Hi all

SD-Access Fabric running with some Extended Nodes (C3560CX).
Clients (Windows) complain about Duplicate IP Adresse. The weird thing is, that the reported MAC address is the MAC address from the Exteneded Nodes - Uplink Interface to the Edge Node...

As we're in migration we have L2 handoff configured with L2 flooding.

Just looking around for a quick workaround: Are the any impacts for the clients/fabric if I disable IPDT on the Extended Nodes?

Problem looks like: https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html

Any Ideas

Re: SDA with Extended Node / Windows Clients DHCP Decline

Scott Hodgdon — Fri, 28 Aug 2020 10:17:50 GMT

Markus,

IPDT must be enabled for a client to register with the Control Plane and for the Control Plane to be informed that a client has unplugged from a switchport. Any changes to the IP Device Tracking configuration put in place by DNA Center should be done with TAC supervision when an SD-Access fabric is in place.

Cheers,
Scott Hodgdon

Senior Technical Marketing Engineer

Enterprise Networking and Cloud Group

Re: SDA with Extended Node / Windows Clients DHCP Decline

markus.forrer — Fri, 28 Aug 2020 11:14:54 GMT

After a closer look, it looks like that not all Extended Nodes are configured the same way...
The Extended Nodes with IPDT activated on the uplink port has no port-channel configuration....

Extended Nodes with IPDT disabled or inacitve on the uplink port has the normal port-channel configuration.....

So the problem is sourced by not proberly provisioned Extended Nodes...