An EX4100 switch managed by Mist may generate the alert “No IPv6 configuration defined for DHCP Server/Relay network” when DHCP relay and/or DHCP snooping is enabled on a network, but the associated IRB has no IPv6 (family inet6 / IPv6 address) configuration.

Mist proactively checks DHCP handling for dual-stack (IPv4/IPv6) readiness, so it can flag this as a potential mismatch even in IPv4-only deployments.

• Mist displays the alert: “No IPv6 configuration defined for DHCP Server/Relay network”.
• DHCP relay and/or snooping is enabled for a network, but the corresponding IRB interface has no IPv6 configuration.
• Often appears after provisioning or template changes.

Option A (if IPv6 isn’t needed and DHCP features aren’t required)

Disable unnecessary DHCP features on the affected network:

1. Go to Switch Templates / Site Config → Network → (affected network).
2. Disable DHCP snooping and/or DHCP relay (whichever is enabled but not required).
3. Save and provision/push the config to the switch.
4. Verify the alert clears.

Option B (if DHCP relay/snooping is required and dual-stack is intended)

• Add the appropriate IPv6 configuration on the IRB interface (family inet6 + IPv6 address), and ensure DHCP-related settings align with the IPv6 design.

Option C (clear a potentially stale DHCP relay object)

If the configuration is correct but the alert persists:

• Delete the DHCP Server/Relay configuration for the affected network, commit/push, then re-add it and provision again.
• This often clears the alert when it’s caused by an inconsistent/stale config state.