Delete IPV6 local link address by ifconfig up/down

Hi all,
I have faced some problem in ifconfig up/down command (linux).
Supposed i have used the ifconfig eth0 command then after i want delete IPV6 local link address so it couldnt able to delete permanetly. How is it possible plz give some suggestion.

For Example:
ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:133:3F:7F:37
inet addr:172.16.170.117 Bcast:172.16.170.255 Mask:255.255.255.0
inet6 addr: fe80::213:d3ff:fe3f:7f37/64 Scope:Link <- here
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:205560943 errors:0 dropped:0 overruns:0 frame:1
TX packets:742535676 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:515791587 (491.8 MiB) TX bytes:3168788086 (2.9 GiB)
Interrupt:193

When fe80::213:d3ff:fe3f:7f37/64 is deleted by ifconfig command
> ifconfig down
> ifconfig up
fe80::213:d3ff:fe3f:7f37/64 apportioned once again

how fe80::213:d3ff:fe3f:7f37/64 is delete.....

 

plz just give some idea. it's very urgent