Link Aggregation - Siemens SCALANCE XM-400 Configuration Manual

A port that was turned off by Link Check must be reset to be able to communicate again. To
do this you have 2 options:
● Pull out the connecting cable and plug it in again.
● Reset the function on both connection partners using the "Reset" button. This must be done
on both devices within 30 s.
Note
When you use the "Reset" button, loops can form temporarily resulting in a loss of data
traffic. The loop is automatically cleared again.
If this is not acceptable for your application, reset Link Check by pulling the cable and
plugging it in again.
After resetting Link Check, the function is restarted on the port and the statistics are reset.
Configuring via a PROFINET IO controller
If MRP is configured via a PROFINET IO controller, you can start the Link Check function for
the optical ring ports of the 1st MRP ring instance using WBM or CLI.
When a new configuration is transferred, Link Check is automatically disabled on all ports that
were not configured as ring ports of the 1st MRP ring instance.
Note
Events relating to the Link Check function are reported only indirectly by PROFINET IO. If the
MRP diagnostics alarms are enabled and a ring port is disabled by LinkCheck, Profinet IO
generates an error message that the connection no longer exists.
4.7

Link aggregation

Link aggregation
With link aggregation, several parallel physical connections with the same transmission speed
are grouped together to form a logical connection with a higher transmission speed. This
method based on IEEE 802.3ad is also known as port trunking or channel bundling.
Link aggregation works only with full duplex connections with the same transmission speed in
point-to-point mode. This achieves multiplication of the bandwidth or transmission speed. If
part of the connection fails, the data traffic is handled via the remaining parts of the connection.
To control and monitor, the Link Aggregation Control Layer (LACL) and the Link Aggregation
Control Protocol (LACP) are used.
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
Technical basics
4.7 Link aggregation
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