running /usr/sbin/brctl showmacs br0
port no	mac addr		is local?	ageing timer
  1	78:28:ca:0a:85:f2	no		   0.00
  1	78:28:ca:1e:1a:2c	no		   0.04
  1	94:9f:3e:b3:e5:04	yes		   0.00
  1	b0:6e:bf:c4:1e:5a	no		   0.00

Multicast Forwarding DB

mc mac	port	member			secs left
01:00:5e:52:6c:d3
	Port 1
		78:28:ca:0a:85:f2	52