Users Guide

Duplicate address discovery
To determine if an IPv6 unicast address is unique before assigning it to an interface, an OS10 switch sends a neighbor
solicitation message. If the process of duplicate address discovery (DAD) detects a duplicate address in the network, the
address does not configure on the interface. DAD is enabled by default.
By default, IPv6 is not disabled when a duplicate address is detected. Only the duplicate address is not applied. Other IPv6
addresses are still active on the interface.
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, then the
ipv6 enable command.
● 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 define an explicit route between two IPv6 networking devices, configure 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 traffic 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. The
length is from 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, from 1 to 255.
After you configure a static IPv6 route, configure the forwarding router’s address on the interface. The IPv6 neighbor interface
must have an IPv6 address configured.
Configure IPv6 static routing and view configuration
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
Layer 3
903