The value of tmnxBsxAarpInstPeerEPSapPortId along with
tmnxBsxAarpInstPeerEPSapEncap and tmnxBsxAarpInstPeerEPSapEncType
specifies the Service Access Point (SAP) end point for the dual
homed peer.
The specification of a tmnxBsxAarpInstPeerEPSapPortId is mutually
exclusive with the specification of tmnxBsxAarpInstPeerEPSdpBindId.
The default value of 0x1e000000 indicates that this is an invalid
port id.