eui-64 will complete the IPv6 addresses with information from the interface MAC Address. Very useful on avoiding duplicate IPv6 addresses in a network as most MAC addresses tend to be unique per interface.
I don't recommend using it on frame-relay interface because of the frame-relay mapping. You need to go into the remote router and type show ipv6 int bri to find the whole MAC address and then use that information in your local router for the mapping. Way too many steps...
On the second question, you need to map the link-local address of the remote router in addition to the IPv6 address for dynamic routing protocols.
On the third question, the :212:7FFF:FE28:0 is the node address, usually derived from the interface MAC address.
1. Interface identifiers (IDs) in IPv6 addresses are used to identify a unique interface on a link and are sometimes referred to as the "host portion" of the IPv6 address.
For Ethernet, the interface ID is
based on the media access control (MAC) address of the interface, in a format called the extended universal identifier 64-bit (EUI-64) format. The EUI-64 format interface ID is derived from the 48-bit MAC address by inserting the hexadecimal number FFFE between
the organizationally unique identifier (OUI) field (the upper three bytes) and the vendor
code (the lower three bytes) of the MAC address. The U/L bit of the first byte is also inverted
2. Shows the frame-relay map where the IPv6 address FE80::212:7FFF:FE28:7100 is mapped to DLCI 306. Broadcast keyword allows the DLCI to forward broadcast and multicast packets, a necessity when using link state routing protocols like ospf
3. 212:7FFF:FE28:0 -- as in point#1 derived from the mac address and inserting FFFE to get the interface identifier
1) EUI-64 is a method used to automaticlly create unique host portion of IPv6 address (last 64 bits of IPv6 address). EUI-64 takes MAC address from router (Router has additional pool of MAC addresses in case if interface is not Ethernet interface) and inserts FFFE hex value into the middle of the MAC address.
2) It is link-local address (IPv4 has no equivalent to IPv6 link-local address). Link-local addresses always begins with prefix FE80::/10 and ends with EUI-64
3) It is ordinary unicast IPv6 address, 212:7FFF:FE28:0 is formed by EUI-64
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