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Usage
Information
Neighbor Discovery Protocol for IPv6 is defined in RFC 2461 as part of the Stateless Address
Autoconfiguration protocol. It replaces the Address Resolution Protocol used with IPv4. It defines
mechanisms for solving problems, such as:
● Router discovery: Hosts can locate routers residing on a link.
● Prefix discovery: Hosts can discover address prefixes for the link.
● Parameter discovery .
● Address autoconfiguration — configuration of addresses for an interface .
● Address resolution — mapping from IP address to link-layer address.
● Next-hop determination.
● Neighbor Unreachability Detection (NUD): Determine that a neighbor is no longer reachable on the
link.
● Duplicate Address Detection (DAD): Allow a node to check whether a proposed address is already in
use.
● Redirect: The router can inform a node about a better first-hop.
Use the ipv6 neighbor command to manually configure the IPv6 address of a neighbor to be discovered by
the switch.
ipv6 route
Establish a static IPv6 route.
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Syntax
ipv6 route [vrf vrf-name] ipv6-address prefix-length {ipv6-address |
interface | interface ipv6-address} [distance] [tag value] [permanent]
[weight weight-value]
To remove the IPv6 route, use the no ipv6 route command.
Parameters
vrf vrf-name (Optional) Enter the keyword vrf followed by the name of the VRF to install IPv6
routes in that VRF.
ipv6-address
prefix-length
Enter the IPv6 address in the x:x:x:x::x format then the prefix length in the /x
format. The range is from /0 to /128.
NOTE: The :: notation specifies successive hexadecimal fields of zeros.
interface (OPTIONAL) Enter the following keywords and slot/port or number information:
● For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port information.
● For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the
slot/port information.
● For a Loopback interface, enter the keyword loopback then a number from 0
to 16383.
● For a port channel interface, enter the keywords port-channel then a
number.
● For a Null interface, enter the keyword null then the Null interface number.
●
For a tunnel interface, enter the keyword tunnel then the tunnel interface
number. The range is from 1 to 16383.
● For a VLAN interface, enter the keyword VLAN then the vlan number. The
range is from 1 to 4094.
If you configure a static IPv6 route using an egress interface and enter the ping
command to reach the destination IPv6 address, the ping operation may not work.
Configure the IPv6 route using a next-hop IPv6 address in order for the ping
command to detect the destination address.
ipv6-address (OPTIONAL) Enter the forwarding router IPv6 address in the x:x:x:x::x format.
IPv6 Basics 865