Flexible port role assignment
In most cases physical LAN ports have the customer role and physical WAN ports
have the network role, but there may be exceptions in some applications. In the
following figure the WAN port connects an EPL link and is therefore at the edge of the
TransLAN
®
network. Thus it has the customer role in this case.
In the example in the figure below the VLAN tags have to be forwarded to a router.
The router uses the tagging information for its switch decisions. Additionally the LAN
port must fulfill a network role. In this case it behaves like a node of the TransLAN
®
network. It could also participate in the STP in order to avoid loops, if there was
another link from a Router LAN interface to a second node within the TransLAN
®
network.
A LAN port which operates in the “network role” behaves like a WAN port in terms of
VLAN tagging, STP, and GVRP.
The default settings are shown in the following table
Physical ports
Port role LAN port WAN port
Customer role default
Network role default
LAN unit
“Ethernet over SDH”
EPL link
LAN
WAN port (“customer role”)
TransLAN
TM
network
LAN unit
LAN unitLAN unit
“Ethernet over SDH”
LAN
TransLAN
TM
network
LAN port (“network role”)
Router
LAN unitLAN unit
Forbidden acc. to STP
Traffic provisioning
Port provisioning
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-77
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