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2.8.1. Address Format

IPv6 Address Format

Full:      2001:0DB8:0000:0001:0000:0000:0000:0001
Shortened: 2001:DB8:0:1::1

Rules:
1. Remove leading zeros in each group
2. Replace ONE consecutive group of all-zeros with ::

IPv6 Configuration

Router(config)# ipv6 unicast-routing
Router(config)# interface GigabitEthernet0/0
Router(config-if)# ipv6 address 2001:DB8:1:1::1/64
Router(config-if)# ipv6 address FE80::1 link-local
Router(config-if)# no shutdown
Verification:
Router# show ipv6 interface brief
GigabitEthernet0/0     [up/up]
    FE80::1
    2001:DB8:1:1::1