Thanks @Harold Ritter  ISP (Starlink) <--> Gi0/0 ISR Router1 Gi0/1 <--> L3 Switch  - Multiple SVI's  On Router1 the ISP facing interface is;interface GigabitEthernet0/0 description Link to Starlink ip dhcp client default-router distance 1 ip address ...

Hi, I realise your last post was in 2018, I was wondering if you got this to work?I'm ion the same boat, I've moved to a new ISP that via prefix-delegation hands me a dynamic /56 my last ISP handed out a static /56On my downstream layer three switch ...