else if (unformat (input, "trace"))
pkt_trace = 1;
else if (unformat (input, "%U",
unformat_vnet_sw_interface, vnm, &sw_if_index))
else if (unformat (input, "trace"))
pkt_trace = 1;
else if (unformat (input, "%U",
unformat_vnet_sw_interface, vnm, &sw_if_index))