Lucent Technologies P550 - Manual (Page 31)

Cajun P550 Switch Overview
Cajun P550/P220 Switch Operation Guide 1-11
OpenTrunk Technology
OpenTrunk technology translates VLAN-tagged frames from one format to another
(including CoS).
The switch is delivered as a plug-and-play IEEE 802.1D standard bridge, but supports
several VLAN tagging schemes. This makes the switch highly interoperable in existing
networks because:
❒ Any port can be a trunk port.
❒ Ports have configurable VLAN tagging on a per-port basis.
❒ Ports process a number of popular VLAN tagging schemes, including major
vendors’ proprietary schemes.
Figure 1-6. Open Trunk Technology
Open Trunk Technology features include:
❒ Switch supports frame encapsulation
• Identifies frame VLAN via tag
• Associates frame priority
❒ Switch supports multiple tagging formats
• IEEE 802.1Q standard draft document
• A major vendor’s multi-level 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.
3Com LinkSwitch
Multilayer
IEEE 802.1Q
3Com LinkSwitch
Multilayer
IEEE 802.1Q
P550
OpenTrunk translates VLAN-tagged frames
from one format to another (including CoS)