The value of tmnxAncpPlcyDisableShcvHldTime specifies how long
SHCV is suspended until the access node sends a port-up message.
If tmnxAncpPlcyDisableShcvHldTime is non zero, the node will suspend
SHCV for the period of time defined. If tmnxAncpPlcyDisableShcvHldTime
is zero, SHCV is suspended until a port-up message is received.