SU means Layer 2 etherchannel in use, P is bundled in port-channel
switchport trunk native vlan 99 switchport mode trunk
Po1 is listed. Native VLAN is 99
12 port cost and 128 port priority
LACP in Po2, fa0/1 and fa0/2 are from Po2 also
Bad configuration, trunk port on one end and access in other end, different protocols and port speed.