Thanks, that helps a lot. When should I be setting up the layer 3 addressing for the VLANs? I want to use the same IPs for the cores and the VLANS, so how can I seamlessly program them without downtime?
if you are using HSRP on the client Vlans you can actually give to the SVIs ip addresses that are different then the old core switches.
Then after having given to VSS root bridge role you can also provide an higher HSRP priority to the VSS so that it serves users in the client Vlans.
About backbone links: if you are using dynamic routing in any form and subnet size allows it you can use different IP address on the VSS the routing protocol will accept this.
If you are using static routes you need to use the same ip addresses that are used as next-hops on the neighbors. In this case you need to shut the SVIs on old core switches and to enable the exact copy on VSS.
Be aware that you need also to clear arp cache on all neighbor devices on backbone links to make them aware of MAC address change or they will try to forward frames to old core nodes' SVI MAC address.
So after having made the VSS root bridge should be the right moment to do that and if possible I would use different ip addresses if not a clear ARP on neighboring devices is needed.
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