Chapter 7. Node and Terminal Plug-ins
Vol. IV-7-68 Alcatel-Lucent
• Shut-down of the DAC GE user ports at both ends of a DAC GE link when
a transport channel is down due to a radio link failure, or similar. When the
transport channel is restored, the user ports are automatically restored at
both ends.
• Shut-down of the transport channel in the event of an Ethernet cable
disconnection or external device failure on the relevant DAC GE port. The
channel shut-down automatically propagates the failed condition to the
far-end DAC-GE. When traffic is restored on the port, the transport channel
is restored, and subsequently the far-end DAC GE port.
Applications that will require link status propagation include:
• Operation with external switches running RSTP or other protocols that only
use Ethernet link status (down/up) to trigger a topology change when a path
failure occurs, and is subsequently restored. When link status propagation is
enabled, a failure on a DAC GE transport channel (radio link for example)
is reflected directly to the external user device through a port shut-down.
This should improve link failure detection times for these devices, compared
to the times needed for conventional hello time-out or polling time-out using
control frames.
• DAC GE L2 link aggregation, when co-located INUs are installed to
provide the physical links. Link aggregation functionality depends directly
on the aggregated port status to confirm the operational status of the
aggregated link, and is selected only on the partner INU/DAC GEs (the
DAC GEs that are not hosting the link aggregation function).
For more information on the Link Status Propagation, refer to Link Status
Propagation Operational Characteristics on page 7-81.
11.
RWPR Port Settings: Click the RWPR Setting tab.
The settings available are used to configure the DAC GE for RWPR (RSTP)
operation, specifically:
• Enabling RSTP operation on required channels/ports.
• Supporting selection of a root switch (in conjunction with other DAC GEs
in the RSTP network.
• Supporting selection the most efficient path (shortest/fastest) to/from the
root switch.
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