This object specifies the method used for assignment
of TrustSec SGT for the line cards without TrustSec
tagging capability.
'none' - assignment of TrustSec SGT is not enabled.
'ingress' - 'ingress' method is used for the assignment of
TrustSec SGT.
'egress' - 'egress' method is used for the assignment of
TrustSec SGT.