Ideally, we want all DHCP-capable devices to move to new subnets if possible and then route between SDA and non-SDA during migration. However, that is is not always possible, so we support L2 Selective Flooding ("selective" because it is on a per IP Pool basis and selected when an IP Pool is added to a VN) and L2 Handoff on a border. L2 Selective Flooding requires multicast to be enabled in the underlay , and this can be done either by LAN Automation or manually.
There are a few important considerations with L2 handoffs:
1. An L2 handoff for a subnet can exist on only one Border at a time. For resiliency, most customers would use a StackWise Virtual pair of Catalyst 9500 High Performance switches, a chassis based system with multiple supervisors or a stack of Catalyst 9300s ( if scale is OK ) to host an L2 handoff.
2. The scale of the Border hosting the L2 handoff differs by platform, and so the number of clients needing the L2 service both inside and outside the fabric will need to be known. If a single Border is not sufficient, additional Borders can be added to host L2 handoffs.
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I'm currently redistributing OSPF to BGP and setting a local pref on the routes. Currently this works fine and having no issues. ip prefix-list ospf-routes seq 10 permit 172.16.100.0/24
route-map ospf-bgp permit 10
match ip address prefix-list ...
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