Users Guide

To disable IPv6 on an interface when a duplicate link-local address is detected, use the ipv6 nd dad disable-ipv6-on-failure
command. To re-enable IPv6 after you resolve a duplicate link-local address, enter no ipv6 enable, followed by ipv6 enable.
• Disable or re-enable IPv6 duplicate address discovery in Interface mode.
ipv6 nd dad {disable | enable}
• Disable IPv6 on an interface if a duplicate link-local address is discovered in Interface mode.
ipv6 nd dad disable-ipv6-on-dad-failure
Disable duplicate address discovery
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable
Disable IPv6 for duplicate link-local address
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable-ipv6-on-dad-failure
Static IPv6 routing
To dene an explicit route between two IPv6 networking devices, congure a static route on an interface. Static routing is useful for smaller
networks with only one path to an outside network, or to provide security for certain trac types in a larger network.
• Enter the static routing information including the IPv6 address and mask in x:x:x:x::x format in CONFIGURATION mode—prex length
0 to 64.
ipv6 route ipv6–prefix/mask {next-hop | interface interface [route-preference]}
– next-hop — Enter the next-hop IPv6 address in x:x:x:x::x format.
– interface interface — Enter the interface type then the slot/port or number information.
– route-preference — (Optional) Enter a route-preference range—1 to 255.
After you congure a static IPv6 route, congure the forwarding router’s address on the interface. The IPv6 neighbor interface must have
an IPv6 address congured.
Congure IPv6 static routing and view conguration
OS10(config)# ipv6 route 2111:dddd:0eee::22/128 2001:db86:0fff::2
OS10(config)# do show ipv6 route static
Codes: C - connected
S - static
B - BGP, IN - internal BGP, EX - external BGP
O - OSPF,IA - OSPF inter area, N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type 2, E1 - OSPF external type 1,
E2 - OSPF external type 2, > - non-active route
Gateway of last resort is not set
Destination Gateway Dist/Metric Last Change
--------------------------------------------------------------------------
S 2111:dddd:eee::22/12via 2001:db86:fff::2 ethernet1/1/1 1/1 00:01:24
IPv6 destination unreachable
By default, when no matching entry for an IPv6 route is found in the IPv6 routing table, a packet is dropped and no error message is sent.
You can enable the capability to send an IPv6 destination unreachable error message to the source without dropping the
packet.
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