Dell PowerConnect 5524P User Manual page 478

Similarly, there may be implied dependencies between encapsulations, so that
specifying an encapsulation implies defining the protocol group for related
encapsulations. An example of this is specifying the Ethernet encapsulation,
even by default, implies IEEE802 encapsulation, as per RFC 1042.
The following standards are relevant:
• IEEE802.1V defines VLAN assignment by protocol type.
• IETF RFC 10-2 defines a standard for the transmission of IP datagrams
over IEEE 802 Networks
Defining Protocol Groups
Define protocol groups in two steps:
1 Define a protocol group by assigning one or more protocols to the group
and giving it a protocol-group ID (any integer), using the Protocol Group
pages.
2 Associate the group with a desired VLAN classification, per port, using the
Protocol Port pages.
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Dell PowerConnect 55xx Systems User Guide