1. LPUF-20 and LPUF-21 are the LPUs added in NE80E/40E V3R3. V3R3C02 supports LPUF-20 and V3R3C03 additionally supports LPUF-21.
2. LPUF-20 does not support the hot-plugging of subcards, while LPUF-21 does.
3. LPUF-20 is further divided into LPUF-20-A and LPUF-20-B. LPUF-21 is further divided into LPUF-21-A and LPUF-21-B. The difference between LPUF-20/21-A and LPUF-20/21-B is that LPUF-20/21-A support L3VPN, MVPN, IPV6 enhancement, and other services, while LPUF-20/21-B do not.