mscFrAtmDlciSiwfLastUnknown1483ProtocolHeader 1.3.6.1.4.1.562.36.2.1.72.4.3.14.1.6

This attribute identifies the most recent unrecognized protocol header that was received from the ATM connection. All the RFC 1483 protocols described in sections 5.3.1.1 through 5.3.1.3 of FRF.8 are supported except ARP.