ipBalance

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A global-unicast IPv6 address is start with binary 001, 2000::/3 and it also known as an aggregatable global IPv6 address. Full global-unicast IPv6 address range is from 2000::/3~3FFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF/128.

Cisco_IPv6_1(config)# interface fastethernet0/0
Cisco_IPv6_1(config-if)# ipv6 address 2001::/64 eui-64
 
Cisco_IPv6_1# show ipv6 interface  brief
FastEthernet0/0            [up/up]
    FE80::CE00:3BFF:FE85:0
    2001::CE00:3BFF:FE85:0
FastEthernet0/1            [administratively down/down]
 

Pinging to site-local IPv6 address from other site of router.

Cisco_IPv6_1# ping 2001::CE00:3BFF:FE85:0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001::CE00:3BFF:FE85:0, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/3/4 ms