The value of tmnxOamVccvTrCtlAssocChannel specifies the launched echo
request's usage of the Associated Channel (ACH) mechanism, when
performing an MPLS-TP VCCV trace route test.
When tmnxOamVccvTrCtlTestSubMode is 'static(2)', the default value
for tmnxOamVccvTrCtlAssocChannel is 'nonIp(2)'.
The supported object combinations for VCCV trace route tests are listed
in the tmnxOamVccvTrCtlTable DESCRIPTION clause.