3Com Switch 7750 Configuration Guide

94 CHAPTER 10: VLAN OVERVIEW
Implementation of
Protocol-Based VLAN
Switch 7750 Ethernet switches assign the packet to the specific VLAN by matching
the packet with the protocol template.
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.