Mode of operation
Ethernet multi-point transport with shared bandwidth can be realized by using any of
the following TransLAN
®
operational modes:
• LAN-VPN mode
• STP virtual switch mode compliant with IEEE 802.1Q
• STP virtual switch mode compliant with IEEE 802.1ad (provider bridge mode)
Related information
Please also refer to:
• “LAN-VPN (M-LAN) mode” (p. 8-64)
• “IEEE 802.1Q STP virtual switch mode” (p. 8-65)
• “Provider bridge mode” (p. 8-67)
VLAN trunking
Trunking applications are a special case of Ethernet multipoint transport, either with
dedicated or shared bandwidth.
Trunking applications are those applications where traffic of multiple end-users is
handed-off via a single physical Ethernet interface to a router or switch for further
processing. This scenario is also called “back-hauling”, since all traffic is transported to
a central location, for example, a point-of-presence (PoP) of a service provider.
Trunking applications can be classified into two topology types:
• Trunking in the hub-node
• Distributed aggregation in the access network
Common to both topology types is that the Ethernet traffic of multiple LANs is
aggregated on one or a few well filled Ethernet interfaces, the trunking LAN
interface(s). Thus, the Ethernet traffic of multiple end-users can be made available to a
service provider at a central location via a limited number of physical connections.
Without VLAN trunking, each end-user would need to be connected to the service
provider equipment via his own Ethernet interface.
Trunking applications include the aggregation of Ethernet traffic of a single end-user as
well as the aggregation of Ethernet traffic of multiple different end-users. Isolation of
the traffic of different end-users can be accomplished by using transparent tagging or
VLAN tagging (see “Tagging modes” (p. 8-68)), depending on the desired mode of
operation.
A typical TransLAN
®
trunking application would be a configuration where many E/FE
access nodes are combined with a trunking GbE hub node (cf. “Distributed aggregation
in the access network” (p. 8-55)).
Trunking in the hub node
This figure shows an example of VLAN trunking in the hub node:
Traffic provisioning
Ethernet over SDH applications
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8-54
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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