Lucent Technologies P550 Manuel d'utilisateur Page 31

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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)
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