The value of tmnxBsxAarpInstPeerEPSapEncType along with
tmnxBsxAarpInstPeerEPSapPortId and tmnxBsxAarpInstPeerEPSapEncap
specifies the Service Access Point (SAP) end point for the dual
homed peer.
The specification of a tmnxBsxAarpInstPeerEPSapEncType is mutually
exclusive with the specification of tmnxBsxAarpInstPeerEPSdpBindId.