Hi Daniel,
I believe you can use "show ipstats vlan " to get the # of IN/OUT packets/Mcast/Bcast inside the vlan. This is not the same, but it's similar.
Output example:
show ipstats vlan "server"
Router Interface server
inet 192.168.100.100 netmask 255.255.255.0 broadcast 192.168.100.255
Stats: IN OUT
14 14 packets
448 448 octets
14 14 Mcast pkts
0 0 Bcast pkts
0 0 errors
0 0 discards
0 unknown protos