Users Guide

● route-preference — (Optional) Enter a route-preference range, from 1 to 255.
Default Not configured
Command Mode CONFIGURATION
Usage
Information
When the interface fails, the system withdraws the route. The route reinstalls when the interface comes
back up. When a recursive resolution breaks, the system withdraws the route. The route reinstalls when
the recursive resolution is satisfied. After you create an IPv6 static route interface, if you do not assign an
IP address to a peer interface, you must manually ping the peer to resolve the neighbor information.
The no version of this command deletes the IPv6 route configuration.
Example
OS10(config)# ipv6 route 2111:dddd:0eee::22/128 2001:db86:0fff::2
OS10(config)# ipv6 route 2111:dddd:0eee::22/128 interface null 0
Supported
Releases
10.2.0E or later
ipv6 unreachables
Enables generating error messages on an interface for IPv6 packets with unreachable destinations.
Syntax
ipv6 unreachables
Parameters None
Defaults ICMPv6 unreachable messages are not sent.
Command Mode INTERFACE
Usage
Information
● By default, when no matching entry for an IPv6 route is found in the IPv6 routing table, the packet
drops and no error message is sent. Use this command to enable sending an IPv6 destination
unreachable error message to the source without dropping the packet.
● The no version of this command disables generating unreachable destination messages.
Example
OS10(config)# interface ethernet 1/2/3
OS10(conf-if-eth1/2/3)# ipv6 unreachables
Supported
Releases
10.4.0E(R1) or later
show ipv6 neighbors
Displays IPv6 discovery information. Entering the command without options shows all IPv6 neighbor addresses stored on the
control processor (CP).
Syntax
show ipv6 neighbors [vrf vrf-name] [ipv6-address| interface interface]
Parameters
● vrf vrf-name — (Optional) Enter vrf then the name of the VRF to display the neighbors
corresponding to that VRF. If you do not specify this option, neighbors corresponding to the default
VRF display.
● ipv6-address — Enter the IPv6 address of the neighbor in the x:x:x:x::x format. The :: notation
specifies successive hexadecimal fields of zero.
● interface interface — Enter interface then the interface type and slot/port or number
information:
○ For a 10-Gigabit Ethernet interface, enter TenGigabitEthernet then the slot/port/subport[/
subport] information.
○ For a 40-Gigabit Ethernet interface, enter fortyGigE then the slot/port information.
○ For a port channel interface, enter port-channel then a number.
○ For a VLAN interface, enter vlan then a number from 1 to 4093.
Layer 3 679