I am also facing same problem. However disabling and enabling port has not helped me to resolve the issue.
can anyone help me to resolve this issue?
Chandan K P
a trunk only forms if some prerequisite are met
-trunking on the ports taht should form a trunk is enabled, use portcfgshow to verify
-isl ports that should form a trunk need to be on the same portgroup of the trunk example port 0-7 or 8-15 or ...
consider before enabling isl/trunks if you want to enable encryption and/or compression