As the RAy3 links have two ports, it is advantageous to use the second port to connect to the backup link. Switching to the backup link is handled directly by the device, which makes it possible to reduce the connection downtime to a minimum (units of milliseconds).
In a common configuration, an 80 GHz link with a capacity of 10 Gbps is connected to the ETH2 port via an optical connection, and a backup connection at a lower frequency, e.g. 18 or 24 GHz, is connected to the ETH1 port.
![[Note]](/images/radost/images/icons/note.png){kind=icon} | Note |
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It is necessary to set “Loop prevention”. This port will not be connected to the port Air and will not form a loop. |
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Switching to the backup route is not hitless. The switching speed is slightly faster on the slave side (by a few milliseconds), so it is more advantageous to set the slave unit on the connectivity side. |
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The configuration shown in Fig. 3.2, “Example of setting the LSP function – Switch to backup link” does not allow in band management to the backup link. It is possible to set the “Loop prevention” parameter on only one side of the link. However, for correct operation, it is necessary to set static entries in the ATU table for the units of the backup link and for the devices on this side of the link. Please see Fig. 3.4, “Example of setting the LSP function – Switch to backup link” and Fig. 3.5, “Example of a static entry in the ATU table”. The appropriate MAC addresses of the backup link units must be associated with both the AIR port and the ETH port to which they are connected. The MAC address of the router (or all MACs on that side of the link) must be set as static for the SFP port. |
