Lucent Technologies P550 - Manual (Page 42)

Overview of the P220 Gigabit Switch Family
2-6 Cajun P550/P220 Switch Operation Guide
Figure 2-2. 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 (Figure 2-3).
3Com LinkSwitch 3Com LinkSwitch
Multilayer Multilayer
IEEE 802.1Q IEEE 802.1Q
OpenTrunk translates VLAN-tagged
frames from one format to another,
including CoS
P220FE
P220G