public McastConfig setEgressInnerVlan(VlanId vlanId) {
        if (vlanId == null) {
            object.remove(EGRESS_INNER_VLAN);
        } else {
            object.put(EGRESS_INNER_VLAN, vlanId.toString());
        }
        return this;
    }
@Test
    public void setEgressInnerVlan() {
        config.setEgressInnerVlan(EGRESS_INNER_VLAN_2);

        VlanId egressInnerVlan = config.egressInnerVlan();
        assertNotNull("egressInnerVlan should not be null", egressInnerVlan);
        assertThat(egressInnerVlan, is(EGRESS_INNER_VLAN_2));
    }