def do_task(ctl, hosts, ifaces, aliases):
m1, m2, sw = hosts
m1_if1, m1_if2, m2_if1, m2_if2, m2_if3, m2_if4, sw_if1, \
sw_br_m1, sw_br_m2, sw_if3, sw_if4, sw_if5, sw_if2 = ifaces
sw_ports = [sw_if1, sw_if2, sw_if3, sw_if4, sw_if5]
tl = TestLib(ctl, aliases)
mt = MrouteTest(tl, hosts, ifaces)
sleep(30)
mt.init()
mt.add_vif(sw_if1, 0)
mt.send_mc_traffic(mcgrp(1), m1_if1, 1)
tl.expect_mr_notif(sw, MROUTE.NOTIF_NOCACHE, m1_if1.get_ip(0), 0, mcgrp(1))
mt.fini()
