This read-write value selects how the switch generates the internal trunk ticket used to pick an egress port within a trunk group, choosing between direct-map, which uses the last two bits of the MAC address, and crc, which runs a CRC algorithm over the full MAC address. It affects how evenly traffic distributes across trunk member ports depending on the MAC address distribution of the traffic. An admin noticing uneven trunk port utilization with direct-map, perhaps because many devices share similar low MAC bits, might switch this to crc(2) for better distribution.