HP 6200YL - Manual (Page 109)

IPv6 Management Features
Viewing and Clearing the IPv6 Neighbors Cache
Clearing the Neighbor Cache
When there is an event such as a topology change or an address change, the
neighbor cache may have too many entries to allow efficient use. Also, if an
unauthorized client is answering DAD or normal neighbor solicitations with
invalid replies, the neighbor cache may contain a large number of invalid
entries and communication with some valid hosts may fail and/or the
show
ipv6 neighbors command output may become too cluttered to efficiently read.
In such cases, the fastest way to restore optimum traffic movement on a VLAN
may be to statically clear the neighbor table instead of waiting for the
unwanted entries to time-out.
Syntax: clear ipv6 neighbors
Syntax:Executed at the global config level, this command
removes all non-local IPv6 neighbor addresses and
corresponding MAC addresses from the neighbor cache except
neighbor entries specified as next-hops for active routes. Note
that the Layer-2 address information for any next-hop route
is cleared until the route is refreshed in the neighbor cache.
ProCurve(config)# clear ipv6 neighbors
ProCurve(config)# show ipv6 neighbors
ProCurve# show ipv6 neighbors
IPv6 ND Cache Entries
IPv6 Address MAC Address State Type Port
--------------------------------------- ------------- ----- ------- ----
fe80::213:c4ff:fedd:14b0 000000-000000 INCMP dynamic
For an active-route next-hop, the MAC address and
source port data is removed, and the State is set to
“Incomplete” until the route is refreshed in the
neighbor cache.
Figure 5-3. Example of Clearing the IPv6 Neighbors Cache
5-5