frAtmDlciSiwfLastUnknown1490ProtocolHeader 1.3.6.1.4.1.562.2.4.1.72.4.3.14.1.3

This attribute contains the most recent unrecognized protocol header that was received from the interface. All the RFC 1490 protocols described in sections 5.3.1.1 through 5.3.1.3 of FRF.8 are supported, except ARP is not supported.