You are correct @Ste . If you are running IOS XE 17.18.2 or newer and do not see the virtual IP (VIP) on the Routing and DHCP Interfaces page, verify both switches are running the correct firmware, are cloud-managed, and are configured as Layer 3 gateways in the same network. Ensure the warm spare configuration is complete, both switches have unique management IPs, and are online in the Meraki Dashboard. If the issue persists, try rebooting the switches or reapplying the configuration. You do not need to manually configure VLAN IPs for the backup VRRP switch; the warm spare configuration will handle the virtual IP assignment for VLAN interfaces.
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