If we have a fully functioning Layer 2 Aggregate Switch network and want to minimise downtime in switching to Layer 3, can we go ahead and create these VLAN Interfaces without it affecting the network until we're ready to cut-over to Layer 3 (and then switch to Warm Spare (VRRP)? We currently have 2 x Meraki MS425 Aggregation switches with a bunch of MS225 edge switches connected via LACP. The 2 x MS425 Aggregation Switches are currently connected to old and fear of failing 2 x Catalyst x3750's which currently are in place for the purpose of routing traffic at Layer 3! Our plan is to configure Layer 3 Switching on the Meraki 425's and switch them to a Warm Spare VRRP setup (accepting that we'll lose our 20Gbps aggregation to edge switches, down to 10Gbps.) This should then hopefully allow us to remove the aging Catalyst x3750 stack. The Warm Spare setup will have the "Primary" MS425 connected to our Preferred NCS/WAN (1gb/1gb) connection, and the "Spare" MS425 connected to our Backup NCS/WAN connection (1gb/1gb).
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