HP 6120XG HP ProCurve Series 6120 Blade Switches IPv6 Configuration Guide - Page 107

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