Quick Reference Guide

244 IPv6 Addressing
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\CLI Folders\Ryan - old template\IPv6Addressing.fm
DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
REACH (Reachable) — Positive confirmation was received within the last ReachableTime milliseconds
that the forward path to the neighbor was functioning properly. While REACHABLE, no special action
takes place as packets are sent.
STALE — More than ReachableTime milliseconds have elapsed since the last positive confirmation was
received that the forward path was functioning properly. While stale, no action takes place until a packet is
sent.
DELAY — More than ReachableTime milliseconds have elapsed since the last positive confirmation was
received that the forward path was functioning properly, and a packet was sent within the last
DELAY_FIRST_PROBE_TIME seconds. If no reachability confirmation is received within
DELAY_FIRST_PROBE_TIME seconds of entering the DELAY state, a Neighbor Solicitation is sent and
the state is changed to PROBE.
PROBE — A reachability confirmation is actively sought by retransmitting Neighbor Solicitations every
RetransTimer milliseconds until a reachability confirmation is received.
Example
The following example displays IPv6 neighbor discovery cache information.
clear ipv6 neighbors
The clear ipv6 neighbors Privileged EXEC mode command deletes all entries in the IPv6 neighbor
discovery cache, except static entries.
Syntax
• clear ipv6 neighbors
Default Configuration
This command has no default setting.
Command Mode
Privileged EXEC mode.
Console# show ipv6 neighbors dynamic
Interface IPv6 address HW address State
------- ---------- --------- -------
VLAN 1 2031:0:130F::010:B504:DBB4 00:10:B5:04:DB:4B REACH
VLAN 1 2031:0:130F::050:2200:2AA4 00:50:22:00:2A:A4 REACH