<div dir="auto"><div dir="auto">The change from MAC address based stable IPv6 addresses is probably the most significant, as described in RFC7217, and becoming the recommended default for SLAAC in RFC8064.</div><div dir="auto"><br></div><div dir="auto">If router vendors implement RFC7217, the concern about swapping a network interface module, and the router's IPv6 address changing, because the MAC address changes, goes away.</div><div dir="auto"><br></div><div dir="auto">I haven't had a chance to look, however somebody from Cisco told me a few years back that they'd implemented RFC7217 for the HSRP floating link-local address.</div><div dir="auto"><br></div><a href="https://www.si6networks.com/2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/" rel="noreferrer noreferrer" target="_blank">https://www.si6networks.com/</a><div dir="auto"><a href="https://www.si6networks.com/2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/" rel="noreferrer noreferrer" target="_blank">2020/08/06/a-brief-history-of-recent-advances-in-ipv6-security-part-i/</a></div></div>