r3#sh ipv6 neighbors
r3#sh ipv6 neighbors
r3#sh ipv6 interface brief
FastEthernet0/0 [up/up]
FE80::C007:5FF:FEFC:0
31:1::3
Serial0/0 [up/up]
Serial0/0.31 [up/up]
FE80::C007:5FF:FEFC:0
13:1::3
FastEthernet0/1 [administratively down/down]
Serial0/1 [up/up]
FE80::C007:5FF:FEFC:0
13:100::3
r3#sh ipv6 neighbors
r3#
why I can not see any ipv6 neighbors even I can ping
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