Reference Guide

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 is broken, the system withdraws the route. The route reinstalls when the
recursive resolution is satised. 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 conguration.
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 the generation of 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 is dropped
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 the generation of 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
Display 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 the keyword vrf and 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 are
displayed.
• ipv6-address — Enter the IPv6 address of the neighbor in the x:x:x:x::x format. The :: notation species
successive hexadecimal elds of zero.
•
interface interface — Enter the keyword interface then the interface type and slot/port or number
information:
– For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port/subport[/
subport] information.
– For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
– For a port channel interface, enter the keywords port-channel then a number.
Layer 3 381