Instruction Manual

Overview of the P220 Gigabit Switch Family

2-6 Cajun P550/P220 Switch Operation Guide

Figure2-2. Tagging Schemes

OpenTrunk technology has the following features:

❒ Switch supports frame encapsulation:

• Identifies frame VLAN via tag

• Associates frame priority

❒ Switch supports multiple tagging formats:

• IEEE pre-standard format based on 802.1Q draft document

• A major vendor’s multi-layer tagging scheme

• 3Com® VLAN Tag and PACE priority signalling

❒ Switch supports translation to and from any format. A packet can enter the switch

with a 3Com SuperStack II VLAN tag and exit the switch as a multi-layer tagged

packet (Figure2-3).

3Com LinkSwitch

Multilayer

IEEE 802.1Q

OpenTrunk translates VLAN-tagged

frames from one format to another,

including CoS

P220FE

P220G