Hey, I'm getting this error while assigning an IPv6 address to sub-interfaceS (G0/0.10-40), I don't know why it worked fine with IPv4 but not with IPv6.
I'm using the same addresses and masks my instructor gave me.
Thanks.
***Error: 2001:D00::/24 is overlapping with 2001:DB8:ACAD:4444::/64 on Serial0/0/0***
hostname Router
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no ip cef
ipv6 unicast-routing
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no ipv6 cef
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license udi pid CISCO2901/K9 sn FTX15248LU6
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spanning-tree mode pvst
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interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address FE80::4 link-local
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interface GigabitEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
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interface GigabitEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.20.1 255.255.255.0
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interface GigabitEthernet0/0.30
encapsulation dot1Q 30
ip address 192.168.30.1 255.255.255.0
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interface GigabitEthernet0/0.40
encapsulation dot1Q 40
ip address 192.168.40.1 255.255.255.0
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interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
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interface Serial0/0/0
ip address 172.16.3.2 255.255.255.0
ipv6 address 2001:DB8:ACAD:4444::2/64
clock rate 128000
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interface Serial0/0/1
ip address 200.40.10.2 255.255.255.0
ipv6 address 2001:DB8:ACAD:5555::2/64
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interface Vlan1
no ip address
shutdown
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ip classless
ip route 10.10.10.0 255.255.255.0 200.40.10.1
ip route 172.16.0.0 255.255.255.0 172.16.3.1
ip route 172.16.2.0 255.255.255.0 172.16.3.1
ip route 172.16.1.0 255.255.255.0 172.16.3.1
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ip flow-export version 9
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ipv6 route 2001:DB8:ACAD:1111::/64 Serial0/0/0 FE80::3
ipv6 route 2001:DB8:ACAD:3333::/64 Serial0/0/0 FE80::3
ipv6 route 2001:DB8:ACAD:2222::/64 Serial0/0/0 FE80::3
ipv6 route 2001:DB8:ACAD:2222::/64 2001:DB8:ACAD:4444::1
ipv6 route 2001:DB8:ACAD:3333::/64 2001:DB8:ACAD:4444::1
ipv6 route 2001:DB8:ACAD:1111::/64 2001:DB8:ACAD:4444::1
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no cdp run
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line con 0
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line aux 0
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line vty 0 4
login
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