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SETUP
Page 30
DOC_DEV_XS_Setup guide_C
7
Fail-safe ring
Based on the STP algorithm, that proprietary redundancy solution makes possible to handle a ring structure
up to 16 SHSDL switches.
One of the switches has to be selected as the ring master ; it has a particular function : The Ring Master will
block one of its ports, preventing the formation of an Ethernet loop, and leave the other in forwarding mode.
When a device or a link fails in the SHDSL ring, the second port will be enabled, allowing to reach all the devices
in the ring.
Remark : In this mode, LAN ports do not participate in the algorithm, only the SHDSL ports are used.
The advantages of that solution is that the failure detection delay and the recovery delay is only a few seconds
(One second if the ring counts 5 SHDSL switches); moreover, it is very simple to configure.
Ring master configuration
•
In the menu, choose
Setup > Ethernet & switching > RSTP
–
Fail-safe ring
.
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