3Com Switch 7750 Configuration Guide Guide

88 CHAPTER 9: VLAN OVERVIEW
The protocol template is the standard to determine the protocol to which a packet
belongs. Protocol templates include standard templates and user-defined
templates:
■ The standard template adopts the RFC- or IEEE-defined packet encapsulation
formats and values of some specific fields as the matching criteria.
■ The user-defined template adopts the user-defined encapsulation formats and
values of some specific fields as the matching criteria.
After configuring the protocol template, you must add a port to the
protocol-based VLAN and associate this port with the protocol template. This port
will add VLAN tags to the packets based on protocol types. The port in the
protocol-based VLAN must be connected to a client. However, a common client
cannot process VLAN-tagged packets. In order that the client can process the
packets out of this port, you must configure the port in the protocol-based VLAN
as a hybrid port and configure the port to remove VLAN tags when forwarding
packets of all VLANs.
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For the operation of removing VLAN tags when the hybrid port sends packets,
refer to the section "Port Basic Configuration" in this manual.