I am receiving IP conflict alerts from the MX250 about our Domain Controller using NIC Teaming. It seems like the NIC ports are taking turns coming online. One port loses connection, the other comes online.
Is there any explanation of why this may be happening and how it can be resolved?
If it is just a domain controller (so it has low bandwidth requirements), I'd be tempted to configure it for simple active/standby NIC. Then the standby NIC will only be used if the primary fails. This will work no matter what kind of switch you have.
Meraki simple config. Tolerant to all sorts of misconfigurations.
If you have a managed switch (such as any Meraki MS) you can use LACP (as suggested by @ww ). LACP can also spread clients across the NICs, and both NICs are active at the same time. You'll need to configure this on your MS:
All of our sites are configured this way. The decision to make would be whether it's better to set up LACP at all of our sites. I'm not sure if there's a pros and cons of using Dell's Broadcom Advanced Control Suite 4.