Users Guide

Table Of Contents
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.
Defaults None.
Command Mode EXEC
Usage
Information
The no version of this command resets the value to the default.
Example
OS10# show ipv6 neighbors
IPv6 Address Hardware Address State Interface VLAN
-----------------------------------------------------------------
1001:db8:a1::2 00:c5:05:02:12:91 REACH ethernet1/1/5 12
1001:db8:a1::f 00:f5:50:02:54:75 REACH port-channel5 12
200::2 00:c5:05:02:12:91 STALE ethernet1/1/10
400::f 00:f5:50:02:54:75 REACH port-channel20
Supported
Releases
10.4.1.0 or later or later
Layer 3 733