The value of tmnxL2tpLnsTgPppProxyLcp specifies
if this system re-uses the result of the Link Control Protocol (LCP)
negotiation done by the proxy (LAC).
If the value of this object is 'always', the Proxy LCP AVPs received from
the LAC are used to initiate the LCP on this system.
If the value of this object is 'never', this system restarts the LCP
negotiation with the remote system.