ipv6 neigh entries getting failed
I have bunch of ipv6 neigh entries which are failed

6000::2828:2802 dev eth2 lladdr 00:1f:a0:02:0e:b2 STALE
7000::1e1e:1e01 dev eth1  FAILED
8000::1e1e:1e01 dev eth1  FAILED
4000::1414:149e dev eth2 lladdr 00:03:00:04:00:09 PERMANENT
5000::1e1e:1e01 dev eth1  FAILED
3000::a0a:a3a dev eth1 lladdr 00:03:00:03:00:09 PERMANENT

Now , When I use flush to remove these entries , it says nothing to flush. Do you guys know how to flush or remove these entries, If i delete the entry, it goes in the failed state. Can  I change the time for these values, so it automatically gets removed in say 10 seconds. 
ipv6 neigh entries getting failed
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I have bunch of ipv6 neigh entries which are failed

6000::2828:2802 dev eth2 lladdr 00:1f:a0:02:0e:b2 STALE
7000::1e1e:1e01 dev eth1  FAILED
8000::1e1e:1e01 dev eth1  FAILED
4000::1414:149e dev eth2 lladdr 00:03:00:04:00:09 PERMANENT
5000::1e1e:1e01 dev eth1  FAILED
3000::a0a:a3a dev eth1 lladdr 00:03:00:03:00:09 PERMANENT

Now , When I use flush to remove these entries , it says nothing to flush. Do you guys know how to flush or remove these entries, If i delete the entry, it goes in the failed state. Can  I change the time for these values, so it automatically gets removed in say 10 seconds. 