Hola,

I have found the following (check the link below as well):

TOS - trunk operational status

TAS - trunk administrative status

TNS - trunk negotiation status

TOT - trunk operational encapsulation type

TAT - trunk administration encapsulation type

TNT - trunk negotiation type

These indicators basically give you the status of the configured trunk on a specific interface.

http://www.freepatentsonline.com/6445715.html

HTH,

GP