IPv6 equivalent of ARP - possibly dumb question

[Frank Bulk - iName.com]

It's my understanding that the closest equivalent of ARP in IPv6 is "sh ipv6
neighbors".  When I do that on our Cisco 7206VXR running 12.2(31)SB16 I see
only a few addresses, not nearly all the ones that I know that the PCs
"obtained" via SLAAC.

How do I see which IPv6 hosts are actively sending traffic through/to our
router?

Frank