Description: If a NULL string is returned as the value, this object is not applicable to that group. The contents of the string can interpreted based on the first byte. if the first byte is 1, the protocol is IP ( for all encaps ). 2, the protocol is IPX 3, the protocol is DECNET 4, the protocol is APPLETALK 5, the protocol is specified as an Ether-Type value with the next two bytes indicating the ether-type value, for e.g banyan vines ether-type will be specified as 08 0B AD 6, the protocol is specified using dsap and ssap values with the next two bytes giving the dsap and ssap value respectively, for e.g for banyan vines llc encap, it would look like 09 BC BC. 7, the protocol is specified using snap header with the next 5 bytes indicating the snap header for that protocol. For e.g if banyan vines snap has to be specified, it would look like, 0A 00 00 00 80 C4. FF, for all protocols.