Router(config)#hostname R1
R1(config)#no ip domain-lookup
R1(config)#banner motd # Authorized Access Only - R1 Gateway IPv6 Router #
R1(config)#interface GigabitEthernet0/0/0
R1(config-if)#description LAN Link to S1
R1(config-if)#ipv6 address 2001:db8:acad:1::1/64
R1(config-if)#ipv6 address fe80::1 link-local
R1(config-if)#no shutdown

R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up
exit
R1(config)#interface Loopback0

R1(config-if)#
%LINK-3-UPDOWN: Interface Loopback0, changed state to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up
description Management Diagnostic Loopback
R1(config-if)#ipv6 address 2001:db8:acad:99::1/64
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console
copy running-config startup-config
Destination filename [startup-config]? 
Building configuration...
[OK]
R1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#ipv6 unicast-routing
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console
copy running-config startup-config
Destination filename [startup-config]? 
Building configuration...
[OK]
R1#show ipv6 interface GigabitEthernet0/0/0
GigabitEthernet0/0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::1
  No Virtual link-local address(es):
  Global unicast address(es):
    2001:DB8:ACAD:1::1, subnet is 2001:DB8:ACAD:1::/64
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:1
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ICMP unreachables are sent
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds
  ND advertised reachable time is 0 (unspecified)
  ND advertised retransmit interval is 0 (unspecified)
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  ND advertised default router preference is Medium
  Hosts use stateless autoconfig for addresses.
R1#show ipv6 neighbors
IPv6 Address                              Age Link-layer Addr State Interface
2001:DB8:ACAD:1:200:CFF:FE6A:EA59           0 0000.0C6A.EA59  REACH Gig0/0/0
2001:DB8:ACAD:1:250:FFF:FE10:97D2           0 0050.0F10.97D2  REACH Gig0/0/0
R1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#no ipv6 unicast-routing
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console
show ipv6 interface GigabitEthernet0/0/0 | include ND router advertisements
                                            ^
% Invalid input detected at '^' marker.
	
R1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#ipv6 unicast-routing
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console
copy running-config startup-config
Destination filename [startup-config]? 
Building configuration...
[OK]
R1#ping 2001:db8:acad:1::999

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:db8:acad:1::999, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

R1#