Overview of the P220 Gigabit Switch Family

Figure 2-2.Tagging Schemes

3Com LinkSwitch

3Com LinkSwitch

Multilayer P220FEMultilayer

P220G

IEEE 802.1Q

OpenTrunk translates VLAN-tagged

IEEE 802.1Q

frames from one format to another,

 

 

 

including CoS

 

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 (Figure 2-3).

2-6

Cajun P550/P220 Switch Operation Guide