The following routes cannot be redistributed into a dynamic routing protocol:
L 192.168.1.1/32 is directly connected, Ethernet0/0 L 2001:1234::1/128 [0/0]

Routes that are marked with an L in the output of the show ip route command or the show ipv6 route command are local host routes. Local host routes cannot be redistributed into a dynamic routing protocol. IPv4 host routes always have a /32 mask, and IPv6 host routes always have a /128 mask. Not all IPv4 routes with a /32 mask are considered host routes.

IPv4 addresses that are manually configured with a /32 mask are considered to be connected addresses and are marked with a C in the output of the show ip route command. Connected routes can be redistributed into a dynamic routing protocol. The following routes are connected IPv4 routes:
C 192.168.1.0/30 is directly connected, Ethernet0/0 C 192.168.1.1/32 is directly connected, Loopback0

The following route is a normal, connected IPv6 route that can be redistributed into a dynamic routing protocol:
C 2001:1234::/64 [0/0]

IPv6 addresses that are manually configured with a /128 mask are marked with an LC in the output of the show ipv6 route command. These LC routes can be redistributed into a dynamic routing protocol. The following route is a local connected route:
LC 2001:1234::1/128 [0/0]