etsysESwitchProtocolIndex 1.3.6.1.4.1.5624.1.2.10.1.4.2.1.3

When etsysESwitchProtocolType indicates a user-defined protocol type, this index should identify the corresponding protocol definition. That is, to say, for a 'userEtherType' row, this index should point to a row in the etsysESwitchEtherTypeTable. When etsysESwitchProtocolType completely specifies the protocol type, this index should be set to 1.