If you want to have the total control of the LLA assigment you usually hardcode things. Technically you can have the same LLA on different interfaces in the same router and nothing bad happens, since it's a LLA, but sometimes administrators wants to have something more "meaningful" and, for example, assign the "FE80::1" LLA to "R1". That is in order to correlate things in your topology.
Message was edited by: Elvin Arias
Arias is right,thats what link local means.Its significant in only 1 segment/subnet.You can treat the LLA like a hostname if you configure LLA like Arias did.here is my example:
R5#show ipv route
O 2001:4::/64 [110/2]
via FE80::4, FastEthernet1/9
via FE80::4, FastEthernet1/4
I have R4 and R5 connecting each other with 2 interface,all with the same LLA to represent a nexthop route(R4 in this case).